It was the year of the great gold rush my dude goodluck
The Triple Alliance and Triple Entente are two opposing alliances that triggered in the start World War I. The formation of these two alliances heightened the tensions between European countries. The Triple Alliance which is composed of <span>Germany, Austria-Hungary, and Italy had a conflict with Triple Entente members - France, Russia, and Great Britain. Germany and Russia, during that time, had a great interest towards the Balkans. This is one of the reasons of the occurrence of World War I. So, the answer to the question is letter d. increasing tensions between European countries.</span>
Before Polk, the United States and Mexico had boundaries along the Rio Grande River. Texas and Polk claimed that America's southern border ran down to the river south of the United States' positon back then. They had a war, but Mexico lost and U.S kept expanding.
Hope this helps!
