Control the so-called center of the world—the Eurasian land mass—and control the world? Russia and China are certainly consolidating control of Eurasia and U.S. influence there is dwindling. From Patrick Armstrong at strategic-culture.org:
The Heartland plus population plus production plus sea power: that’s the end of the “Columbian Age”.
In 1904, the British geographer, Halford Mackinder, read a paper named “The Geographical Pivot of History” at the Royal Geographical Society. In the paper he advanced a hypothesis on the influence of geographic reality on world power relationships. This is sometimes regarded as the founding moment of the study of geopolitics. Looking at the whole planet, he spoke of the “heartland” – the great landmass of Eurasia – and the Islands – the large islands of the Americas and Australia and the small islands of the United Kingdom and Japan. (Parenthetically, he does not seem to have much concerned himself with Africa or South America.) For most of history, Europe was an isolated and not very important appendage of this great world mass, subject to continual raids from the nomads of the Heartland, and the outer islands played no part in world events.
All this changed about five centuries ago when what he called the “Columbian Age” began. That is to say, the time when Europe discovered sea power. This gave the Islands a great dominance over the Heartland. In 1905, however, he saw the situation changing with the construction of railways which could connect the Heartland. In 1919 he produced his famous “triad”:
<<Who rules East Europe commands the Heartland.
Who rules the Heartland commands the World Island.
Who rules the World Island commands the world.>>
His fear then was Germany+East Europe=world dominance. But the triad was not intended to be true for all time – he would not agree thirty years later that the USSR’s rule over East Europe plus the World Island meant rule over the world; Mackinder adapted his theory to the realities as he saw them. And, after the Second World War, he believed that the Islands (USA+UK+allies) could control the Rimlands and therefore lock out the Heartland (USSR). The “Rimlands” were an later addendum to his 1904 theory: these were the territories subject to influence by sea power; that is the edges of the Heartland.