i think the answer to this very question is a
sudden movements and try to leave slowly
the answer is mississippi river.
the second westward happened before the revolutionary war. the americans started crossing the appalachian mountains in order to get into the ohio valley. the leader was daniel boone. he led his people to the kentucky country and after the war the families settled the territory. the united states settled westward to the mississippi river.
harriet tubman was a good person, she was an american political activist and abolitionist. she was born into slavery and escaped to rescue enslaved family and friends. later in life she served as an armed scout and spy for the united states army and then struggled later on for women's suffrage.