Serbia supplied the rebels with weapons so that they could kill the archduke. Austria-Hungary declared war on Serbia. Russia entered to defend Serbia because they both had large Slavic populations. Germany entered to defend Austria-Hungary. Alliances drew other countries in until it was a world war.
With magic and people build an empire by breaking their peace and doing wars so there can be more land
Government,science,the arts and literature.
The transcontinental railroad allowed for the transportation of goods over long distances. This was especially helpful for the industrial north at the time.
