Answer:
"During his tenure, U.S. President James K. ... Polk accomplished this through the annexation of Texas in 1845, the negotiation of the Oregon Treaty with Great Britain in 1846, and the conclusion of the Mexican-American War in 1848, which ended with the signing and ratification of the Treaty of Guadalupe-Hidalgo in 1848."
What was the main reason for Europe's great population growth in the 1800´s? the death rate fell
Points were usually fastened to a short foreshaft, and then that foreshaft was inserted into the body of the lance. When they were hunting big game like the mammoth, Clovis and Folsom people would probably thrust the weapon into the animal, breaking off the foreshaft.
A confederate system sits at the other extreme in terms of centralization. A confederacy is a loose relationship among a number of smaller political units. The vast majority of political power rests with the local governments; the central federal government has very little power. Local governments have a great deal of freedom to act as they wish, but this freedom often leads to conflicts between states and the federal government. In some cases, a confederacy is little more than an alliance between independent states.