August 23 - Army Maj. Nidal Hasan is convicted of 13 counts of murder and 32 counts of attempted murder for a shooting rampage at Fort Hood in 2009. On August 28, Hasan is sentenced to death.
August 31 - President Barack Obama announces that he will seek congressional approval for a U.S. strike on Syria, in retaliation for the Syrian President Bashar al-Assad's use of chemical weapons on his own people.
September 10 - In a speech before the U.S. public, President Obama says he will not, "put American boots on the ground in Syria" but does not rule out other military options.
September 12 - Flooding in Colorado leaves eight people dead, and more than 2,000 homes destroyed.
September 16 - Twelve people are killed inside the U.S. Navy Yard in Washington, DC. The shooter, identified as Aaron Alexis, 34, is also killed.
October 1 - A federal government shutdown goes into effect at midnight, as the new fiscal year officially begins without an agreement on legislation to keep the government funded.
October 1 - As part of the rollout of the 2010 Affordable Care Act, health insurance exchanges open online. Technical problems plague the sites.
October 17 - The U.S. government reopens after President Obama signs a bill ending the government shutdown.
November 1 - TSA officer Gerardo Hernandez is killed at Los Angeles International Airport, allegedly by 23-year-old Paul Ciancia.
November 13 - Hawaii governor Neil Abercrombie signs into law a bill making same-sex marriage legal. The law will take effect in December 2013.
November 20 - Illinois governor Pat Quinn signs a bill legalizing same-sex marriage in the state. The law will take effect June 1, 2014.
Notable International Events: January 11 - France carries out air strikes in Mali, to aid in that country's battle against Islamic militants in the north.
January 27 - More than 200 people are killed in a nightclub fire in Santa Maria, Brazil.
February 11 - Pope Benedict XVI announces his resignation due to age and declining health. He is the first pope to resign in almost 600 years.
February 12 - North Korea conducts its third nuclear test.
March 13 - Cardinal Jorge Mario Bergoglio is elected the 266th pope. His papal name is Pope Francis.
March 25 - Cyprus and European leaders agree to a bailout worth 10 billion euros, to prevent the collapse of Cyprus' banking system.
April 14 - Nicolas Maduro is elected president of Venezuela. He replaces longtime leader Hugo Chavez, who died on March 5th.
April 24 - In Savar, Bangladesh, a building housing several garment factories collapses, killing more than 1,000 people.
April 28 - Enrico Letta is sworn in as Italy's new prime minister.
June 5 - Former Pakistani Prime Minister Nawaz Sharif again is elected prime minister.
July 3 - Egyptian president Mohamed Morsy is ousted in a military coup.
July 22 - Duchess Catherine and Prince William welcome their first child, a son weighing 8 lbs, 6 oz. The baby is named Prince George Alexander Louis of Cambridge.
August 1 - Russia grants one-year of asylum to leaker Edward Snowden, who had been living in a Moscow airport since June 23rd.
August 20 - Former Pakistani leader Pervez Musharraf is indicted in the 2007 assassination of former Prime Minister Benazir Bhutto.