In contrast, English geographer Mackinder took a more European approach to geopolitics. He focused on land power rather than sea power as the determinant of a nation’s global status. Mackinder formulated the heartland theory, which defined the center of Eurasia as the world’s heartland and argued that the dominant global power would come from this region. Its coastal areas – much of Europe, the Middle East and East Asia – were seen as secondary powers and areas beyond Eurasia, including the entire Western Hemisphere, as largely irrelevant. Mackinder updated his model following the two world wars, elevating North America and the North Atlantic to a status almost equivalent to that of the heartland. South America, however, still played a minimal role in Mackinder’s updated model.
Spykman believed that Mackinder overemphasized the importance of the heartland and instead posited that the center of global power was in the rimland, the coastal areas around Eurasia. He viewed the Caribbean Sea and surrounding areas as the American Mediterranean because of their central location in the Western Hemisphere. He also believed that the dividing line between north and south in the Western Hemisphere was not the Isthmus of Panama but the northern edge of the Amazon. According to Spykman, then, the northern part of South America, including Colombia and Venezuela, was essentially part of North America and included in the American Mediterranean. He believed the U.S. needed to dominate the Caribbean to establish regional security and that the construction of the Panama Canal further increased the importance of the Caribbean and the Pacific Ocean in U.S. strategy. For Spykman, the U.S. faced few challenges in the Western Hemisphere, but any threat to its domination of the hemisphere come from the southern cone.
There are two important takeaways from these three models. First, the Caribbean, which includes the northern coast of South America, plays a key role in U.S. maritime security. This explains why the U.S. has intervened in Caribbean conflicts and why developments in South America can be critical to U.S. interests. Second, the northern nations of South America represent a borderland between North and South America. Conflicts and instability in this region threaten to draw in countries from both continents, and the Venezuelan crisis is one key example of this.
Brazil’s Territorial Integrity
Geographically, Brazil is defined by three key features: its large size, its natural boundaries and its north-south divide. Brazil is the fifth-largest country in the world by landmass and has long faced the challenge of filling and controlling that space. Portugal was forced to colonize northeast Brazil (rather than use it as a trading post) and move south for both security and economic reasons. Shortly after the Portuguese arrived in the Americas, other European powers followed.
While it had an agreement with Spain on how to divide their respective territories, no such deal existed with the U.K., France and the Netherlands – all three of which challenged Portuguese claims in the New World. The colony also needed land, labor and resources. Portuguese pioneers therefore pushed west for land on which to grow sugar cane and to find indigenous populations for enslavement.
Natural geographic barriers, however, limited Portuguese expansion beyond Brazil’s current borders. But in terms of security, its geography actually worked in its favor. Natural barriers insulated the country from the rest of South America and protected it from external threats. In the north, the Amazon’s dense forest and vast size prevented major military incursions from Venezuela, Colombia and Peru. Farther south, the massive Pantanal swamp fortified borders with Bolivia and Paraguay. In the east, the Atlantic Ocean protected Brazil from outside powers. The one area of geographic vulnerability is its flat southern border, though Uruguay provides some strategic depth there as a buffer state.
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