Answers:
b. 1776
a. the Declaration of Independence
a. All nations are conceived in liberty
I think that one of the main ones most of the time is drought as we have such a dry and hot climate. But currently flooding is an issue, in Tasmania we just had the biggest flood since the 1921 floods (Look it up).
Northern parts of Australia are also prone to tropical cyclones

c. <u>The lend-Lease Act of 1941</u> demonstrates the U.S. shift from neutrality to involvement in World War II.
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<u>Hope it helps You. </u>✌✌</h2>
B. A condition is just the way that it is and there is nothing to be done about it [I think]