Okay well they are connected in this way.
Christianity is connected to the Crusades, The Holy Land is located where Islam is the most prevalent.
There currently is a conflict between the different sectors of Island. The results of the Crusades was mass death. I would answer it something that, explain how they are connected.
Hope this helps!
Answer:
Germany wanted to open a front in the Americas. With the "distraction" of Mexico attacking, it may lead to US cutting off supplies and troops that would have gone to the Western Front to fight to defend their own homeland. As the Allies were heavily dependent on US products & material, this shortage of supply would lead to a weakened front, easing the front for the Germans to take advantage of.
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