There have been many important events that happened which many people don't know about or have forgotten about.
1.) Tarim mummies
A group of mummies that are ancient(1800BCE) were discovered in the Tarim Basin in China, DNA studies discovered that the mummies were part East Asian and part European, proof that interracial relationships were common even in Ancient days.
2.) The expeditions of Nazi Germany
Many people know that the third reich was so interested into the occult and anthropology. What many people have forgotten about are the expeditions of the third reich to various places in the world including Tibet and Antarctica. Heinrich Himmler sent the "Ahnenerbe"(ancestral heritage society) to Tibet. Heinrich Himmler had a lot of interest in Asian culture. The purpose of the expedition was mostly scientific. The expedition was led by Ernst Schäfer.
The third reich also has also had a expedition in Antarctica for resources. This would inspire many sci fi movies.
3.)The formation of the 442nd RCT
After Pearl Harbor many Japanese-Americans were sent to internment camps. What a lot of history classes don't teach is the formation of the 442nd RCT of the US army. This unit was made of Japanese-American soldiers who enlisted in the army to fight against the fascists in Europe. This unit is currently the most decorated unit of it's size in US army history. Franklin D Roosevelt made a positive comment on the 442nd RCT
The principle on which this country and by which it has always been governed is that Americanism is a matter of the mind and heart; Americanism is not, and never was, a matter of race or Ancestry-Franklin D. Roosevelt
4.) Operation paperclip
As a result of Germany losing WWII, the allied nations stripped Germany of it's military power and took most of Germany's technological innovations for themselves. A lot of the military technology used today(Assault rifles, ballistic missles etc) is based off Germany's military technology. America and the Soviet Union took German scientists to work for them.
Operation paperclip is the name of the operation used to bring German scientists(over 1000 scientists) to America. Among them was a man named Wernher Von Braun. Wehrner was a German scientist that worked for the nazis, he invented the V-rockets for the nazis and the Saturn V for America which would take the first people the moon and the first Sattelite of the US. Everyone knows about Margaret Hamilton and the first people that visited the moon but everyone forgets about Wehrner Von Braun.
5.) Hawaii democratic Revolution of 1954
A lot of people assume that the first major social movement happened in the 1960s but one social movement happened earlier in 1954. It was a social movement that involved civil disobedience, strikes and protests. A lot of the 442nd RCT veterans became involved in this movement. The peaceful revolution was successful in which the "white minority rule" was overthrown, Hawaii became a state of the US, working conditions improved, the Democrats became a majority and many Japanese-Americans took office such as Daniel Inouye a 442nd RCT Veteran.
6.) Abolishing anti miscegenation laws
Anti Miscegenation laws are cruel and thankfully they have been abolished in the 1950s. By the 1960s, interracial marriage became more accepted.
7.) How clothing has changed throughout the years
One subject that is often ignored is the clothing people wear, nobody talks about how fashion continues to change as a result of new ideas.