(CNN)Here is a look back at the events of 2019.
Notable US Events
January 1 - Jamel Ahmed Mohammed Ali Al-Badawi, the terrorist behind the 2000 attack on the USS Cole, is killed during an airstrike in Yemen according to a statement from US Central Command.
January 3 - California Rep. Nancy Pelosi is elected the new House speaker in a majority vote by the House of Representatives on the first day of the 116th Congress.
January 12 - Former Housing and Urban Development Secretary Julián Castro announces his Democratic presidential bid.
January 14 - About 30,000 Los Angeles educators go on strike, affecting more than half a million students.
January 22 - The Supreme Court allows President Donald Trump's transgender military ban to go into effect.
January 25 - Roger Stone is arrested after being indicted by a grand jury on charges brought by special counsel Robert Mueller, who alleges the longtime Trump associate sought stolen emails that could damage Hillary Clinton in coordination with senior Trump campaign officials.
January 25 - A 35-day government shutdown ends when Trump signs a short-term spending measure, providing three weeks of stopgap funding while lawmakers work on a border security compromise. The bill does not include any wall funding.
January 28 - Author Marianne Williamson launches her Democratic presidential campaign.
February 2 - Hawaii Rep. Tulsi Gabbard launches her Democratic presidential campaign.
February 12 - A New York jury convicts Mexican drug lord Joaquin "El Chapo" Guzman on 10 counts including engaging in a continuing criminal enterprise, conspiracy to launder narcotics proceeds, international distribution of cocaine, heroin, marijuana and methamphetamine, and use of firearms. He is later sentenced to life in prison plus 30 years.
February 14 - The Senate confirms (54-45) William Barr as attorney general. He is sworn in at the White House.
February 15 - Trump declares a national emergency to allocate funds to build a wall on the border with Mexico. During the announcement, the president says he expects the declaration to be challenged in court. The same day, Trump signs a border security measure negotiated by Congress, with $1.375 billion set aside for barriers, averting another government shutdown.
February 18 - Attorneys general from 16 states file a lawsuit in federal court challenging Trump's emergency declaration.
February 19 - Vermont Sen. Bernie Sanders announces his Democratic presidential bid.
February 22 - R&B singer R. Kelly is charged with 10 counts of aggravated criminal sexual abuse.
March 1 - Washington Gov. Jay Inslee announces his Democratic presidential bid.
March 7 - Lobbyist and former Trump campaign chairman Paul Manafort is sentenced in Virginia to 47 months in prison for bank fraud, filing false tax returns and failure to file reports of foreign bank and financial accounts.
March 12 - Fifty people, including actresses Felicity Huffman and Lori Loughlin, are charged with offenses related to a college admissions cheating scheme.
March 13 - Manafort is sentenced to an additional 43 months in prison for conspiracy against the United States and conspiracy to obstruct justice in the District of Columbia.
March 13 - Trump announces the United States is grounding all Boeing 737 Max 8 and Max 9 aircraft, amid concerns over their involvement in two major plane crashes less than six months apart.
March 22 - Mueller finishes the Russia probe and delivers his report to Barr.
March 24 - Barr releases a letter summarizing the principal conclusions from Mueller's investigation. According to Barr's four-page letter, the evidence was not sufficient to establish that members of Trump's campaign tacitly engaged in a criminal conspiracy with the Russian government to interfere with the election.
April 4 - Ohio Rep. Tim Ryan announces his Democratic presidential bid.
April 8 - California Rep. Eric Swalwell announces his Democratic presidential bid.
April 15 - Former Massachusetts Gov. Bill Weld announces he is running for the Republican nomination for president, on CNN's The Lead with Jake Tapper.
April 18 - A redacted version of Mueller's report on Russian interference with the 2016 presidential election is released.
April 22 - Massachusetts Rep. Seth Moulton announces his Democratic presidential bid.
May 2 - Colorado Sen. Michael Bennet announces his Democratic presidential bid.
May 14 - Montana Gov. Steve Bullock announces his Democratic presidential bid.
May 16 - New York Mayor Bill de Blasio announces his Democratic presidential bid.
May 29 - Mueller delivers his first public statement about the Russia investigation. He says charging Trump with a crime was not an option the office could consider; because a sitting president cannot be indicted per Justice Department policy. "If we had had confidence that the president clearly did not commit a crime, we would have said so," Mueller says. "We did not, however, make a determination as to whether the president did commit a crime." He announces the special counsel's office is closing, and he's resigning from the DOJ.