The invention of the printing press by Gutenberg
protestant movements succeeded a great deal because of the invention of the printing press which enabled people to access the bible and theological materials and compare them with the status quo of the catholic church. The catholic church had long abused the ignorance of the laymen in access in the bible to come up with dogmas and canon laws that are un-Biblical. Some of the catholic liturgical traditions are yet to be repealed.
The Organisation of the Petroleum Exporting Countries is an intergovernmental organisation of 15 nations, founded in 1960 in Baghdad by the first five members, and headquartered since 1965 in Vienna, Austria.
The Homestead Act was attractive to settlers, because it gave land to anyone over 21, or head of family (even women and former slaves), who applied for land, this land for a very cheap price (or no price at all) and through this it enabled easy settlement. The farmers had to then cultivate the land for a period of time, and if they did not abandon it and tended to it properly, it became their property.
Antietam is the bloodiest day in American history