It was a mixture of various reasons, although for the Spanish and Portuguese it was a question of reaching India for spice trades after the embargo instated on them by the Ottoman Turks.
The Portuguese went around Africa, and the Spanish tried sailing west across the barren ocean, and accidentally discovered America through Columbus.
The answer is number 4. Or the 4th answer you put down for the question.
Causes: Renaissance encouraged curiosity, investigation, discovery, modern day knowledge. Caused people to question old beliefs. During the era of the Scientific Revolution, people began using experiments and mathematics to understand mysteries. Effects: New discoveries were made, old beliefs began to be proven wrong.
In short, Germany was close to being defeated, and America wanted to be part of the post war carve up (when territory was divided). The US was supplying war materials to the Allies and could not do so while maintaining complete neutrality. There was also the sinking of the British ship Lusitania which angered the US. Also, the Zimmerman telegram.
hopefully this helps! (:
Seven Weeks’ War, also called Austro-Prussian War, (1866), war between Prussia on the one side and Austria, Bavaria, Saxony, Hanover, and certain minor German states on the other. It ended in a Prussian victory, which meant the exclusion of Austria from Germany. The issue was decided in Bohemia, where the principal Prussian armies met the main Austrian forces and the Saxon army, most decisively at the Battle of Königgrätz. A Prussian detachment, known as the army of the Main, meanwhile dealt with the forces of Bavaria and other German states that had sided with Austria. Simultaneously, a campaign was fought in Venetia between the Austrian army of the south and the Italians, who had made an alliance with Prussia.