What factors led or contributed to conflict between Mexico and Texas? Who stood to gain from this conflict? Why?

What would be the benefit for Mexico, Texas, and US?

Cause of Mexico-U.S. war

Explanation: Initially the united states declined to incorporate it into the union, largely because northern political were against the addition of a new slave state. the Mexican government was also encouraging border raids and warning that any attempt at the annexation would lead to war.  

the answer is c.richard m. nixon

union blockade

explanation:

the union blockade in the american civil war was a naval strategy by the united states to prevent the confederacy from trading.

the blockade was proclaimed by president abraham lincoln in april 1861, and required the monitoring of 3,500 miles (5,600 km) of atlantic and gulf coastline, including 12 major ports, notably new orleans and mobile. those blockade runners fast enough to evade the union navy could only carry a small fraction of the supplies needed. they were operated largely by british citizens, making use of neutral ports such as havana, nassau and bermuda. the union commissioned around 500 ships, which destroyed or captured about 1,500 blockade runners over the course of the war.