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.
In the U.S. it is also known as the Mexican War; in Mexico it is also known as the U.S. Intervention, the U.S. Invasion of Mexico, the United States War Against Mexico, and the War of Northern Aggression (this last name is more commonly used in the American South to refer to the American Civil War).eneral Zachary Talyor on campain during the Mexican-American War. The U.S. government claimed that the southern border of Texas was the Rio Grande; Mexico maintained it to be the Nueces River.