Which of the events listed had most affected the early development of the united states? why do you think so? what were the effects of the event? the war of 1812 the louisiana purchase the monroe doctrine

Its kinda a personal  question and my answer  is the louisiana  purchase. this is because it doubled  the amount of land that belonged to the u.s. it also caused much growth by making more jobs  and more land for farmers or ranchers to purchase  from the government. so all-in-all it was what caused the world to grow to an amazing place

The american anti-slavery society (aass) (1833–1870) was an abolitionist society founded by william lloyd garrison, and arthur tappan. frederick douglass, an escaped slave, was a key leader of this society who often spoke at its meetings.