Answer: The president may require the "principal officer" of any executive department to tender his advice in writing. While the Constitution nowhere requires a formal Cabinet, it does authorize the president to seek advice from the principal officers of the various departments as he (or she) performs their official duties.
Explanation:
They served as scouts and spies for the union. They also enlisted in the union.
The U.S used the Texas-Mexico border dispute to annex Texas as a state and gain more land from Mexico. Basically all the land that Mexico owned in North America was given to the U.S after the U.S defeated Mexico in the war.
The American Perspective is clearly evident on their produced tv shows. Here, you could immerse yourself in American culture and ideas. This the way how Americans communicate and share their identity to the world for better understanding. As their are varied show genres to appeal to, each is always interesting.