Answer:
On May 12, 1846, the United States Senate voted 40 to 2 to go to war with Mexico. President James K. Polk had accused Mexican troops of having attacked Americans on U.S. soil, north of the Rio Grande. But Mexico claimed this land as its own territory and accused the American military of having invaded. The Treaty of Guadalupe Hidalgo was signed in 1848, the treaty allowed the United States to purchase California, Arizona, New Mexico, Texas, Nevada, Utah, and Colorado for fifteen million dollars, doubling the size of the United States, but also displacing millions of Mexican citizens in new American territory. Mexico also gave up all claims to Texas and recognized the Rio Grande as America's southern boundary.
Hope this helps!!! :)
There are many aspects to Romanticism, although from the list above perhaps the best options are "emotion" "mystery" and "melancholy"
By majority vote of the states, with each state having one vote (decided by majority rule of the state delegates). no meeting unless at least 7 states were represented, discussions kept secret from public
If I were to give a very general answer, this is the concept of imperialism/expansionism. Humans seek to improve themselves by nature i.e. rich people want to become richer. In the same way, Japan (and actually any powerful country) would want to expand and colonise/seize other countries to improve their global standing and become more powerful. (Imagine if Japan seized every country - we would be under their control! - just a thought haha)