Push factors include war, famine, descrimination ect. in the native country of the migrant eg Irish people were pushed to emigrate to america and england during the Great Hunger (1845-1849)
pull factors include the promise of good job opportunities in america, hot climate, ect
the Louisiana purchase of 1803 bought into United States about 828,000 squere miles of territory from France, there by doubling the size of the young republic
