French and Indian war (also known as the seven years war), led tensions between the 13 colonies and Britian. This is because in this war france lost New France to the British. When taxes began to rise in the colonies and Americans were starting to rebel, French were happy to help since it would be a sort of revenge since losing their colony in North America.
Easier travel and trade.. with others outside
The constitution was added
When Charles John Davids proposed to Madison Al Newert 3/4/1884 somewhere in Africa.
And when Jesus Christ said good morrow to James Heartyfult 19/6/2004.
Just off the top of my head.
Some were sent to prison for their part for their atrotices during ww2