United States is a federal republic country, which has fifty states including five major territories and various outlying islands. The territories were separated from Pacific Ocean and the Caribbean Sea. United States shares a common border with the state of Alaska and five territories with outlying islands. It also shares land borders with Canada and Mexico and coastal line borders with Russia, Cuba and Bahamas. In terms of land,
United States is considered as the world's third largest country. United States is considered as the world's largest national economy in the world and second in terms of purchasing power parity. The US has abundant natural resources and has been the world's largest national economy. United States is the major producer of oil and natural gas and Pharmaceutical products.
There are many lists of cardiology journals, which emphasize in the field of cardiology and United States is one of the countries, which maintain cardiology journals in regular frequency. With the aim of creating innovation in the field of research and development, United States is spending more and more expenditure in the research side and therefore gaining good gross domestic product in this cardiology field and also supporting to publish this research in journals which are ther in america cardiology journals list. There are many cardiology institutes in United States such as Heart Institute and Texas Heart Institute which were supported by the United States country are considered as leading cardiology research institutes and offering good research in the field of cardiology. There have been numerous list of cardiology journals America such as American Journal of Cardiology, International Journal of Cardiology, Journal of the American Heart Association and many other United States cardiology journals, which are running with good number of articles and good reputation.