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.
â¢ Treaty of Guadalupe Hidalgo. â¢ Mexican War. Definition: Area of the present-day United States that Mexico agreed to give up as part of the Treaty of Guadalupe Hidalgo, which ended the Mexican-American War. This territory included all of the present-day states of California, Nevada, and Utah and also parts of Arizona, Colorado, New Mexico, Utah, and Wyoming.