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On January 14, 2011, Morgan was drafted number one overall in the 2011 WPS Draft by the Western New York Flash. She was the first California Golden Bears women's soccer player to be drafted in the first round of Women's Professional Soccer.
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Morgan was named to the United States U-20 women's national team that competed in the 2008 FIFA U-20 Women's World Cup in Chile, scoring a total of four goals in the tournament against France, Argentina and North Korea; her last goal scored against North Korea was subsequently voted the best goal of the tournament, and later FIFA's second-best goal of the year. Morgan's performance on the field earned her the Bronze Shoe as the tournament's third-highest scorer and the Silver Ball as the tournament's second-best player behind teammate Sydney Leroux.
She has been capped by the senior national team, first appearing as a substitute in a match versus Mexico in March 2010, and scored her first international goal after coming on as a substitute against China in October 2010. Her most important goal to date came a month later in a crucial road game against Italy, with a Women's World Cup berth on the line for the United States.
Morgan was on the national team that placed second in the 2011 FIFA Women's World Cup. She was the youngest player on the U.S. roster. On July 13, 2011, she scored her first FIFA Women's World Cup goal in the 82nd minute of the semi-final matchup against France, giving the USA a 3–1 lead and ultimately, the victory. She scored the first goal (69') in the FIFA World Cup Final against Japan after coming on as a substitute at the half, as well as assisting on the Abby Wambach header (104') for a goal in extra time.
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