The upper chambers are called the atria respectively right and left atrium.The lower chambers in your heart are called the left ventricle and the right ventricle. Answer: The heart is made up of four interior chambers. There are two upper and two lower chambers which create the muscle.
There's a chance it was China. Today, the U.S. has an open-trade policy with China, which means goods are traded freely between the two countries, but it wasn't always this way. On February 21, 1972, President Richard M. Nixon arrived in China for an official trip. He was the first U.S. president to visit the People's Republic of China since it was established in 1949. This was an important event because the U.S. was seeking to improve relations with a Communist country during the Cold War.
One of the main reasons Richard Nixon became the 1952 vice-presidential candidate on the Eisenhower ticket was his strong anti-communist stance. Despite this, in 1972 Nixon became the first U.S. president to visit mainland China while in office. Ulysses S. Grant visited China on a world tour after leaving office. Herbert Hoover lived in China briefly in 1899 before becoming President and could speak Mandarin.