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.
Area of Texas that was added to U.S. The Mexican War was fought between the United States and Mexico through 1846-1848. It was a battle to see if Texas, who had just claimed its independence from Mexico, would be a U.S. territory or a Mexico territory. The countries fought hard for two years both believing they deserved Texas as their territory. Fast Facts