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Timeline: Key Events in U.S. History that Defined Generations

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The Generational Power Index
The Generational Power Index
Introducing our new index, which ranks U.S. generations on their economic, political, and cultural influence.

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GPI Timeline Biggest Historical Events by Generation

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Key Events in U.S. History that Defined Generations

Looking back at history is a necessity when trying to understand what the future may hold.

Using insights from our Generational Power Index 2021 report, along with survey data from Pew Research in 2016, we identified some key milestones for each cohort, to understand how these events helped shape each generation’s unique perspectives.

Quick Context on Generational Definitions

Before diving in, it’s important to clarify which generations we’ve included in our research, along with their age and birth year ranges.

GenerationAge range (years)Birth year range
The Silent Generation76 and over1928-1945
Baby Boomers57-751946-1964
Gen X41-561965-1980
Millennials25-401981-1996
Gen Z9-241997-2012
Gen Alpha8 and below2013-present

These generational categories aren’t universal, but we went with the most widely cited definitions from reputable U.S. sources including the Pew Research and the U.S. Federal Reserve. It’s also worth noting that these generational definitions are somewhat specific to North America. For this reason, the focus is on U.S. historic events.

Defining Events: Silent Generation

The oldest members of the Silent Generation were 11 years old at the start of World War II, and were teenagers by the time it ended. In other words, their formative years fell smack dab in the middle of one of the biggest international conflicts in modern history.

Because of this, it makes sense that World War II ranks as the second most impactful event in their lifetimes, trailing only the far more recent Sept. 11 terrorist attacks (2001).

Most Impactful Historic Events, Silent Gen (Survey Results)

RankSilent GenSurvey %
#1Sept. 1159%
#2WWII44%
#3JFK Assassination41%
#4Vietnam War37%
#5Moon landing29%
#6Obama election28%
#7The tech revolution27%
#8Civil rights movement18%
#9Korean War18%
#10Iraq/Afghanistan wars14%

In fact, the Silent Generation cited four different wars on their list, more than any other cohort. For context, Boomers identified three conflicts (including the Cold War), while Millennials only referenced one (Iraq/Afghanistan).

Of course, other not-so-violent events made the list as well. And interestingly, some of these impressionable moments occurred later on in life.

For example, the youngest members of The Silent Generation were already in their mid-t0-late forties when cellphones became common in the ‘90s—yet, 27% identified the tech revolution as one of the top 10 most impactful events that happened in their lifetime.

Clearly, life never stops throwing you curve balls—no matter how far along you might be.

Most Notable Historical Events: Baby Boomers

Many of the historical experiences cited by Baby Boomers were related to war and violent acts. For instance, Boomers identified two assassinations on their list—John F. Kennedy’s in 1963, and Martin Luther King’s in 1968.

Most Impactful Historic Events, Boomers (Survey Results)

RankBaby BoomersSurvey %
#1Sept. 1170%
#2JFK Assassination45%
#3Vietnam War41%
#4Obama election38%
#5Moon landing35%
#6The tech revolution26%
#7Civil rights movement18%
#8Fall of Berlin Wall/end of Cold War16%
#9MLK assassination15%
#10Iraq/Afghanistan wars11%

For this generation, the moon landing in 1969 made the cut, as did Barack Obama’s election win in 2008.

Baby Boomers only identified one event that was unique to their cohort (Martin Luther King’s death). It’s worth noting that responses varied between Americans of different racial backgrounds. Not surprisingly, Black Americans were far more likely to name MLK’s death as a top defining moment.

Most Notable Historical Events: Gen X

For Gen Xers, two unique events made their list: the Challenger disaster (1986) and the Gulf War (1991). Interestingly, neither of of these events stood out for other generations.

The Challenger disaster impact was widely felt because it involved civilians alongside astronauts, making the space shuttle’s explosion all the more notorious.

Most Impactful Historic Events, Gen Xers (Survey Results)

RankGen XSurvey %
#1Sept. 1179%
#2Obama election40%
#3Fall of Berlin Wall/end of Cold War21%
#4The tech revolution20%
#5Iraq/Afghanistan wars18%
#6Gulf War15%
#7Challenger disaster14%
#8Gay marriage10%
#9Hurricane Katrina10%
#10Columbine shooting9%
#11Orlando shooting9%
#12Oklahoma City bombing9%

Hurricane Katrina (which occurred in 2005) is the only natural disaster to make it on any of these lists. The hurricane—which caused a significant share of New Orleans’ population to resettle—left a lasting impression on the nation.

Most Notable Historical Events: Millennials

Millennials remember the September 11 attacks the most of all generations, with 86% citing it as their most influential event. They also paid close attention to the aftermath of this occurrence, as marked by the inclusion of both the Iraq/Afghanistan wars and the death of Osama Bin Laden among their most notable events.

Most Impactful Historic Events, Millennials (Survey Results)

RankMillennialsSurvey %
#1Sept.1186%
#2Obama election47%
#3Iraq/Afghanistan wars24%
#4Gay marriage19%
#5The tech revolution18%
#6Orlando shooting17%
#7Hurricane Katrina11%
#8Columbine shooting10%
#9Bin Laden10%
#10Sandy Hook7%
#11Boston Marathon bombing7%
#12Great Recession7%

Sadly, a lot of Millennials recollect instances of gun violence more than any other generation, from Orlando and Columbine to Sandy Hook.

Last but not least, Millennials are the only generation to note the Global Financial Crisis of 2008, and the subsequent Great Recession, as a momentous event. This makes sense considering many of them began their careers in its aftermath.

Gen Z and Younger

The Pew Research survey data was collected in 2016, so opinions on more recent events have not been collected.

That said, it could be premature to say in the short term which events will leave a lasting impression on generations, young and old.

According to the above data, the election of Barack Obama was a lasting milestone in recent history. Will the election of Donald Trump leave a similar impact? How will COVID-19 be regarded in the future? Time will tell which events will define future generations.

Moments, Movements, and Everything in Between

One key takeaway worth emphasizing is just how varied these formative events can be. Some were experienced as a single moment, while others were a culmination of shifts over several years.

It’s also clear that timing and duration are not the only determining factors behind an event’s influence on American society. For example, the moon landing was a tangible moment with a date stamp, whereas the tech revolution has a much fuzzier start (before exploding in significance alongside the Dotcom boom and bust).

Also interesting is what is absent from the top results. For example, the Global Financial Crisis of 2008 is barely referenced.

In short, a variety of impactful events and more gradual revolutions have made their mark on American society. Some have influenced specific generations, while others have transcended generational boundaries and unified the American public.

Download the Generational Power Report (.pdf)

The Generational Power Index

For a full methodology of how we built the Generational Power Index, see pages 28-30 in the report PDF. This is the first year of the report, and any feedback is welcomed.

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Demographics

Charted: Unauthorized Immigrants in the U.S., by Country of Origin

The U.S. has over 11 million unauthorized immigrants.

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This Voronoi graphic visualizes the country of origin for the unauthorized immigrant population in the U.S.

Visualizing Unauthorized Immigrants in the U.S.

This was originally posted on our Voronoi app. Download the app for free on iOS or Android and discover incredible data-driven charts from a variety of trusted sources.

More than any other nation, the U.S. is home to over 46 million immigrants. Of these, over 11 million are unauthorized immigrants.

This graphic visualizes the countries of origin for the unauthorized immigrant population in the U.S., based on 2021 estimates from the Migration Policy Institute (MPI), published in September 2023. Because these estimates are based on 2021 figures, they don’t capture the record number of border encounters witnessed in 2022 and 2023.

Mexico’s Overall Share is Declining

According to the MPI, Mexico accounted for 7.7 million unauthorized immigrants in 2008. This suggests a 32% decline to the latest estimate of 5.2 million.

CountryRegionUnauthorized Immigrants
🇲🇽 MexicoNorth America5,203,000
🇬🇹 GuatemalaNorth America780,000
🇸🇻 El SalvadorNorth America751,000
🇭🇳 HondurasNorth America564,000
🇮🇳 IndiaAsia400,000
🇵🇭 PhilippinesAsia309,000
🇻🇪 VenezuelaSouth America251,000
🇨🇳 ChinaAsia241,000
🇨🇴 ColombiaSouth America201,000
🇧🇷 BrazilSouth America195,000
🌍 Rest of World2,322,000
Total11,217,000

Guatemala, El Salvador, and Honduras follow Mexico. According to the Migration Policy Institute, immigration from these three countries has been the most significant contributor to the growth of the Central American-born population in the U.S. since 1980. Roughly 86% of Central Americans in the United States in 2021 were born in one of these three countries.

India comes in fifth. According to U.S. Customs and Border Protection, an unprecedented number of undocumented Indian immigrants have been crossing U.S. borders on foot in recent years.

Among the factors for the increase in Indian immigration to the U.S. are the overall growth in global migration since the pandemic, oppression of minority communities in India, and extreme visa backlogs.

Learn more about unauthorized immigrants in the U.S. by our breakdown by U.S. state found here.

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