How has society changed over the past 100 years?

Why did Einstein encourage President Roosevelt to start the Manhattan project? What were some pros and cons of 19th century immigrants? Which was the first state to sign the Declaration of Independence? What is a difference between English law and the laws affecting slaves in Virginia was that under English law? What was the last major battle of the revolution was the battle of? Is the African man head of his household? The Anglo-Saxon root lep as used in the English word leap is best defined by what? The event that spawned from the taunting and throwing of snowballs at a British soldier guarding a customs house became known as the? Who was the successor and son to Darius of Persia? How much does Christopher Columbus make yearly? In ancient Greece what effect did the geographic setting have on a civilization back to there? What are facts about Septimus Severus? What were the results of World War 2 in China? Who manufactured purple heart medals during Vietnam war? How do historians know about the life of Eliza Lucas Pinkness? How much experience does the narrator have with war? Did doctors in Tudor times make sure no one had cuts if they were ill so no one else would get the illness? What job black womwn did in 1904? Why is it important to conserve your history? Who was the slave that traveled with Lewis and clark?