The major Allies were Britain, France, and Russia in WWI and Britain, France, the Soviet Union, the U.S., and China in WWII. Nine nations are members of the world's nuke club. Conclusion On The List of Countries By Military Power Ranking In The World 2020 In conclusion, the write up has critically probed into the meaning and factors to look into as to know if a country has a military strength and some basic things to be made available before the military strength of a nation can be discussed. For so long the richest country on the planet, the US will have to contend with being âsecond bestâ. France, the most-visited country in the world, is the third-largest economy of Europe and the sixth-largest in the world, with a nominal GDP of $2.78 trillion. List and ranking of GDP growth, GDP per capita and couuntry share of World's GDP Recognized great powers came about first in Europe during the post-Napoleonic era. The U.S. and Russia own the majority of the world's nuclear weapons. Countries in the world ranked by Gross Domestic Product (GDP). The US retains its position as the world's most-powerful country. The pivotal power in World War II, the United States saved â¦ 1. As measured by GDP by purchasing power parity (PPP), which adjusts for price level differences across countries, China already has the largest economy in the world. In 2050, China is expected to be the worldâs richest, and probably the most powerful, economy, with a GDP of $24.62 trillion and a per capita income of $17,759. The formalization of the division between small powers and great powers came about with the signing of the Treaty of Chaumont in 1814. The United States built the largest, most productive economic engine in human history. istock. There are about 14,500 nuclear weapons in the world. The Roman Empireâwhich reached the height of its power in the second centuryâwas by far the dominant power in most of the ancient world. China. The finalized Global Firepower ranking below utilizes over 50 individual factors to determine a given nation's PowerIndex ('PwrIndx') score with categories ranging from military might and financials to logistical capability and geography. Global powers ranked by potential military strength. Allied powers, those countries allied against the Central Powers (Germany, Austria-Hungary, and Turkey) in World War I or against the Axis powers (Germany, Italy, and Japan) in World War II. Country-by-country list of plugs, sockets and voltages Below is a full overview of all countries of the world and their respective plugs/outlets and voltages/frequencies used for domestic appliances.