Theodore Roosevelt is nominated for the presidency by the Progressive Party, a group of Republicans dissatisfied with the renomination of President William Howard Taft. Also known as the Bull Moose Party, the Progressive platform called for the direct election of U.S. senators, woman suffrage, reduction of the tariff and many social reforms. Roosevelt, who served as the 26th president of the United States from 1901 to 1909, embarked on a vigorous campaign as the party’s presidential candidate. A key point of his platform was the “Square Deal”—Roosevelt’s concept of a society based on fair business competition and increased welfare for needy Americans.

On August 7, 1947, Kon-Tiki, a balsa wood raft captained by Norwegian anthropologist Thor Heyerdahl, completes a 4,300-mile, 101-day journey from Peru to Raroia in the Tuamotu Archipelago, near Tahiti. Heyerdahl wanted to prove his theory that prehistoric South Americans could have colonized the Polynesian islands by drifting on ocean currents.

From the Atlantic Missile Range in Cape Canaveral, Florida, the U.S. unmanned spacecraft Explorer 6 is launched into an orbit around the earth. The spacecraft, commonly known as the “Paddlewheel” satellite, features a photocell scanner that transmitted a crude picture of the earth’s surface and cloud cover from a distance of 17,000 miles. The photo, received in Hawaii, takes nearly 40 minutes to transmit.

The United States Congress overwhelming approves the Gulf of Tonkin Resolution, giving President Lyndon B. Johnson nearly unlimited powers to oppose “communist aggression” in Southeast Asia. The resolution marked the beginning of an expanded military role for the United States in the Cold War battlefields of Vietnam, Laos and Cambodia.

On August 7, 1987, Lynne Cox braves the freezing waters of the Bering Strait to make the first recorded swim from the United States to the Soviet Union.

At 10:30 a.m. local time, a massive truck bomb explodes outside the U.S. embassy in Nairobi, Kenya. Minutes later, another truck bomb detonated outside the U.S. embassy in Dar es Salaam, the capital of neighboring Tanzania. The dual terrorist attacks killed 224 people, including 12 Americans, and wounded more than 4,500. The United States accused Saudi exile Osama bin Laden, a proponent of international terrorism against America, of masterminding the bombings. On August 20, President Bill Clinton ordered cruise missiles launched against bin Laden’s terrorist training camps in Afghanistan and against a pharmaceutical plant in Sudan, where bin Laden allegedly made or distributed chemical weapons.

On August 7, 2005, a Russian Priz AS-28 mini-submarine, with seven crew members on board, is rescued from deep in the Pacific Ocean. On August 4, the vessel had been taking part in training exercises in Beryozovaya Bay, off the coast of Russia’s far-eastern Kamchatka peninsula, when its propellers became entangled in cables that were part of Russia’s coastal monitoring system. Unable to surface, the sub’s crew was stranded in the dark, freezing submarine for more than three days.