WASHINGTON — Less than two weeks after his reelection, President Obama will become the first US president to visit the once-pariah nation of Myanmar, drawing attention to the country’s shift to democracy and highlighting what his administration regards as a marquee foreign policy achievement.

Obama will also travel to Cambodia, a first for a US president as well, and to Thailand during the Nov. 17-20 trip. In Cambodia, the president will attend the East Asia summit in Phnom Penh and meet with leaders of the Association of Southeast Asian Nations.