The pacemaker may have one to three leads, depending on the type of pacemaker needed to treat your heart problem. There are different types of pacemakers: Single-chamber pacemakers use one lead in the upper chamber (atria) or lower chamber (ventricles) of the right side of the heart.
The MexicanâAmerican War, also known as the Mexican War, the U.S.âMexican War or the Invasion of Mexico, was an armed conflict between the United States of America and the United Mexican States from 1846 to 1848.
The Mexican War officially ended on February 2, 1848 when America and Mexico agreed to the Treaty of Guadalupe Hidalgo. With this treaty, Mexico recognized Texas as independent and the Rio Grande as its southern border. In addition, through the Mexican Cession, America required land that included parts of present-day Arizona, California, New Mexico, Texas, Colorado, Nevada, and Utah.