The American decoration of independence was signed in July 4 1777 before it was signed the revolutionary war started then American president Abe Lincoln made a speech in the battle of Pittsburgh. And then a US president wanted land called “Louisiana Territory” then they wanted to claim Texas,California and the west side so a us official offered money to Mexico if they gave them land then they said no then the fought for the land then they started a war called the mexican war then usa won The end