Who actually started the Mexican-
American War? The U.S. or Mexico?

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Explanation:

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Mexico claimed the Nueces River as its northeastern border, while the U.S. claimed the Rio Grande River, and the day that both troops met at the Rio Grande and the Mexican army opened fire, on April 25, 1846, the Mexican American War began.

Explanation:

The answers are:

17 - Judicial appointments made by President Adams on the last minutes of his presidency.

18- The Federalists were attempting to make the judiciary their stronghold.

19- Could no longer establish new colonies in the Wetern Hemisphere.

20- The supreme court had the authority to determine the constitutionality of a law.