Which statement best explains how the War of 1812 contributed to the growth of the United States to include these states?

Question

Large numbers of soldiers later settled in the territories where the war had been fought.
Military heroes from the war went into politics in the territories where the war had been fought.
The reduction of British aid to Native Americans near the Mississippi River made white settlement easier.
British aid significantly grew the economies of the territories in the Mississippi River Valley.

Answer 1

The reduction of British aid to Native Americans near the Mississippi River made white settlement easier.