A maritime power (sometimes a naval power) is a nation with a very strong navy, which often is also a great power, or at least a regional power. A maritime power is able to easily control their coast, and exert influence upon both nearby and far countries. A nation that dominates the world navally is known as a maritime superpower. Many countries that become maritime powers become strong to defend themselves from an extant threat, as the USSR did during the Cold War to defend itself from the United States Navy. In that scenario, it is common for the emerging maritime power to focus largely upon area denial tactics, rather than power projection. Maritime powers are much more involved in global politics and trade than other powers. Its status as an island nation that needed naval protection against Continental European states, Britain's fleet of naval and trade ships had already become several times larger than that of its closest rival before the advent of the Industrial Revolution. Britain maximised the economic advantage of the Industrial Revolution only by using the same naval power to convince or to force other countries to purchase its factory-manufactured goods. The Roman Empire by 30 BC, Roman dominion extended from the Iberian Peninsula to Egypt. Romans controlled the whole Mediterranean Sea and called it Mare Nostrum (Latin: "Our Sea"). The Republic of Venice dominated trade on the Mediterranean Sea between Europe, North Africa, and the Levant from the High Middle Ages to the beginning of the early modern period. It conquered numerous territories along the Adriatic Sea. The Republic of Genoa was one of the most powerful maritime and commercial powers of the Mediterranean and the Black Sea during the Late Middle Ages. The Swedish Empire. The Dominium maris baltici ("Baltic Sea dominion") policy of the Kingdom of Denmark and the Kingdom of Sweden during the late medieval and early modern eras helped lead the Swedish Empire's domination of the Baltic Sea. The Portuguese Empire pioneered the Age of Discovery during the 15th.