What's the context?
The industrial revolution
Even further back...
The agricultural revolution
Trade?
Communication?
Travel?
Exploration?
After then U.S. President Woodrow Wilson's failed attempts to negotiate an agreement with Germany to end the unrestricted attacks of German submarines on British ships the German Foreign Minister, in what came to be known as the Zimmerman Telegram, invited Mexico to join the war alongside Germany and offered to help Mexico recover the Texas, New Mexico and Arizona territories. The UK intercepted the telegram and passed the information along to President Wilson. America saw this invitation as an act of war and so in an effort to put an end to militarization from foreign opposition U.S. congress called for war on Germany on April 6th, 1917.
A. the rise and fall of successive families of rulers in China
The dynastic cycle is the theory that each new dynasty goes through a cultural cycle under the mandate of heaven.
"Any one" should be the right answer.
