Which country was the first to ally with germany?

Poland. Poland was the first ally of Germany and this union was the beginning of the Second World War.  

By signing the pact with Hitler, the Polish leadership counted together with the Nazis to oppose Czechoslovakia and Russia. The Support from Warsaw allowed Germany to prepare to begin the Second World War.

the mongolian invasion of china and central asia resulted in a disruption of the silk road as the chinese garrisons lost support from the chinese kingdoms which fell under the mongols. however, as the mongols established a formal dynasty in china, the successors of genghis khan restored the garrisons along the silk road allowing the safe travel caravans again.

they united the colonies in their fight against the british.