The idea of nullification was NOT a legacy of the Civil War.
The correct answer between all the choices given is the last choice or letter D.
D.the idea of nullification
Explanation:
The Sesquicentennial of the American Civil War is an occasion to reflect the legacy of that great conflict. This legacy is our heritage, and despite many permanent features, we continue to accommodate the resolution of that conflict. The Civil War was supported over constraint, but not always on account of slave.
It impacted the encounters and exchanges because the disease that the European explorers brought to the Indians land was killing off their community (Tribe) and most of the Indians died and only left a few alive.