The states below were added to the union during the decade following the war of 1812:
indiana (1816)
mississippi (1817)
illinois (1818)
alabama (1819)
maine (1820)
missouri (1821)
which statement best explains how the war of 1812 contributed to the growth of the united states to include these states?
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  :

The War of 1812 contributed to the growth of the United States by including new states because the reduction of British aid to Native Americans near the Mississippi River made white settlement easier.

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

Explanation:

from a previous ans on :

1- During the War of 1812, many native tribes collaborated with the British in exchange for economic aid and resources.

With the British defeat, the natives, who had been the main contenders of the Americans in the fighting (losing 10,000 men) were weakened in their position in their territories, to such an extent that those territories were effectively occupied and organized by representatives of the U.S.

Read more on -

might be agreeing to participate ethically with other european nations in the slave trade

or notifying other european nations when taking possession   of african territories

the answer would be logic.