To pay off the French, and keep american affairs out
The Chinese people invented the Seismometer during the Han dynasty to help predict natural disasters. The Seismometer measured the motion of the ground, and things included of seismic waves such as, earthquakes, volcanoes, and other things that involve explosions that are generated by seismic waves.
About one-third increase to the size of the United States. The states of Nevada, Arizona, California, Utah and some parts of New Mexico and the Gadsden purchase completes the southern parts of Arizona and New Mexico. This land is from Mexico acquired by the United States.
Higher levels of production and economic growth for the country.
It was a monarchy because it was under a kingdom