What did most americans understand before their country entered world war i?
o
that the war would not last long
that the war would cost american lives
that the war would the us economy
o that the war could be won by the us alone

B. that the war would cost American lives

Explanation:

stone age, iron age, olden days, prehistory

explanation:

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stan bts

2686-2181 bce-- "egyptian civilization developed along the nile river in large part because the river’s annual flooding ensured reliable, rich soil for growing crops."

1069-664 bce-- "ancient egyptians developed wide-reaching trade networks along the nile, in the red sea, and in the near east."