An economic depression is the period wherein the economic activity slows and unemployment increases.
Economic depressions are also associated with currency inflation and require significant government intervention to turn the tide.
Answer:
The immediate cause of World War I that made the aforementioned items come into play (alliances, imperialism, militarism, nationalism) was the assassination of Archduke Franz Ferdinand of Austria-Hungary. In June 1914, a Serbian-nationalist terrorist group called the Black Hand sent groups to assassinate the Archduke.
Commodore Matthew C. Perry
Perry was warmly received by Japanese officials who had acquiesced and prepared a treaty that fulfilled many of Fillmore's demands. The Treaty of Kanagawa ensured the protection of American property and opened the ports of Hakodate and Shimoda to trade.
