Definitely The Grand Army of the Republic
Started the creation of railroads witch helped industrial revolution happen so fast
This was known as the Freedom summer
It was an initiative to get as many African-Americans to vote as possible in the elections in Mississippi. The initiative was organized because they had historically been segregated and were not allowed to vote through various means even when they did have constitutional rights to do so, ever since the civil war.
Italian polymath Galileo Galilei espoused the view of heliocentricism in the early 17th century, contrary to the geocentrism which was commonly accepted at the time.
