Answer:
D. Referendum
Explanation:
If citizens are unhappy if a piece of legislation and want it struck down they have the right to call a referendum. This allows the people to vote on it directly.
Answer:
Giving the Union control of the Mississippi River
Explanation:
The Union wanted control of the Mississippi to cut off trade and transport for the South. The river being taken also made things harder for the Confederates (because it cut their side in half, so the Union had the upper hand).
New York was settled by the Dutch... i would go with option A
Australia is a Federal Country. The country is known to have a powerful central government, and has states/provinces around it that are provided with sufficient self-rule. However, it's still the central government that rules above all matters in Australia.