From the Overview: "Thailand is a long-time military ally and economic partner of the United States. These ties endure,but more than a decade of political turmoil in Thailand, including two military coups in 2006 and 2014, has complicated U.S.-Thai relations and erased Thailand's image as a model democracy in Southeast Asia. Thailand conducted nationwide elections in March 2019--its first since 2011--and in June seated a new government led by Prime Minister Prayuth Chan-ocha, the former Commander-in-Chief of the Royal Thai Army who led the 2014 coup. The polls were conducted under new rules drafted by the junta that structurally protect the military's influence, and questions remain about the new government's popular legitimacy. The military government also rewrote Thailand's constitution to create a military-appointed Senate, and was widely criticized for harassment of government critics and severe restrictions on freedom of expression and assembly."
CRS In Focus, IF10253
Congressional Research Service: https://crsreports.congress.gov/