The Hemisphere Comes FirstFortress Americas: A New Monroe Doctrine argues that America’s security begins at home—not in Europe, the Middle East, or Asia. The Western Hemisphere, stretching from the Arctic through the Amazon and down to Antarctica, has become the decisive strategic theater as China, Russia, Iran, transnational cartels, and terrorist networks expand their influence throughout the Americas.The unipolar era has ended. A tripolar world, loosely divided among the United States, China, and Russia, is emerging, and spheres of influence are returning. Russia is consolidating its regional control. China is constructing its Indo-Pacific sphere. The United States must secure its own hemisphere before it can responsibly project power abroad.The book proposes a new strategy of Western Hemispheric Defense that integrates military power, industrial capacity, energy dominance, border security, maritime control, and regional partnerships into a single defensive architecture. Without that strategic depth, the United States risks gradual encirclement by its rivals. With it, America can restore its national power, protect the homeland, and compete successfully in the coming era of great-power competition. To remain a global power, the United States must build a fortress in the Western Hemisphere.