Recount the stages of johnson's escalation of the vietnam war up to 1967. why did the conflict become a "quagmire"?

At firs Johnson sent advisers and gave weapons to the South Vietnamese so that they fight the North Vietnamese.  Later on U.S. bombers bombed parts of North Vietnam and ground troops were committed to assist the South.  More and more troops were being sent until the U.S. became deeply involved in the conflict.  When public support decreased, the U.S. began its withdrawal from South Vietnam.

the correct answer is a) egypt and china.

egypt and china are two of the world’s oldest civilizations known by man. both ancient empires have left a great historic and cultural legacy to the world through archeology. both civilzations developed complex social relations, had deep religious beliefs, had dominion of agriculture and left writing records to understand their customs and culture.

among the requirements to consider a civilization, we find urbanization, writing records, a place of residence, agriculture methods, technological specialization, means of transportation, currency, population density, social stratification, and political integration.