Political boundaries of 19th-century europe countries frequently changed due to ? a) social reforms and colonialism b) revolutions and nationalism c) economic depression and court decisions d) diplomacy and suffrage

The correct answer is B) revolutions and nationalism.

Political boundaries of the 19th-century Europe countries frequently changed due to revolutions and nationalism.

Small countries came and went from one territory to another due to revolutions, as it happened with Prussia and Italy. Nationalism played a key role in forming nations in that similarities in identity and race allow the formation of other countries. The French Revolution influenced many ideas that were followed by other nations. Many countries confronted the authority of the monarchy and demanded changes in politics and the economy under strong nationalist ideals. Countries formed after independence movements such as the case of Poland, Romania, and Bulgaria.

china unilaterally claims the entire south china sea as sovereign territory, then builds artificial islands to bolster its claim. it suddenly activates an air defense identification zone over the east china sea, and threatens to down any aircraft that does not report its position. it builds roads into indian territory, then redraws the maps to show that it is actually chinese territory. the people's republic under president xi jinping is quickly becoming the bully of asia.