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 1845, America tried buying huge parts of Mexican land that included present day California and New Mexico. When Mexico refused to part with its land, America tried using force. Mexico and America both maintained that the border was theirs. This led to the beginning of the Mexican America War that would last for two years (1846-48). America won the war decisively. Mexico had to give up California, New Mexico, Utah, Nevada and parts of Colorado, Wyoming and Arizona.