What were the major territorial acquisitions of the United States between 1803 and 1853 and how did they change the country's boundaries? How did the United States achieve each territorial expansion?
a) Louisiana Purchase, Florida Purchase, Texas Annexation, Treaty of Guadalupe Hidalgo; achieved through treaties and military conquest
b) Oregon Treaty, Gadsden Purchase, Mexican Cession, Alaska Purchase; achieved through diplomatic negotiations and purchase agreements
c) Annexation of Hawaii, Alaska Purchase, Oregon Treaty, Treaty of Guadalupe Hidalgo; achieved through colonization and settlement
d) Louisiana Purchase, Texas Annexation, Mexican Cession, Gadsden Purchase; achieved through political agreements and economic incentives