Manifest destiny was the idea that the United States would stretch from sea to sea as a beacon of liberty. Texas had lots of American immigrants at the time and had a lot of slave plantations that could of extended the south. Texas also had recently broken free from Mexico, and was made by American settlers who made their government based on the US. So, because of all this, America decided to annex Texas and incorporate it into the Union.
He opposed it because he felt that it made the rich get richer and since he favored the common people and felt that it wasn't fair toward the common people .
A U+V mixed together with steepness
For exampe look above.
During World War II, Marshall was instrumental in preparing the U.S. Army and Army Air Forces for the invasion of the European continent. Marshall wrote the document that would become the central strategy for all Allied operations in Europe.