Answer:
Imperialism - Nations competed for more land, colonies and raw materials. Great Britain and Germany competed industrially, which led to these nations needing more raw materials. Also, Austria-Hungary controlling the Slavic land of Bosnia, which Serbia believed belonged to them.
Nationalism - Nationalism was very strong in both Germany and France. Germany controlled the territory known as Alsace-Lorraine, which they gained from France after the Franco-Prussian War. France wanted that land back.
Alliances - Secret alliances were formed prior to the outbreak of the war. After the Assassination of Franz Ferdinand the Archduke of Austria-Hungary the alliance systems went into effect leading to many nations protecting one another (i.e. Russia protecting Serbia from Austria-Hungary).
The completion of the first transcontinental railroad in 1869 encouraged settlement of the American west by proving easier travel and it took less time.
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The Chinese created things called "Terraces" which were flat areas to help them raise their crops.
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Ah cool!
This would be referring to the Homestead Act! They would give the land to anyone who was willing to work on or improve the land.
The land was given almost free of cost and all the new owner of the land was required to do, was work the land until it was ready for farming/crops, and then they had to build a house for themselves (and possibly their family).
