Which action by the US in the early 1960s deepened conflict in Vietnam? restoring the former emperor to power
ignoring the concept of domino theory
supplying military advisers and weapons
not intervening after the assassination of the president

i think it would be a

nationalization is the set of dispositions and operations by means of which the state assumes, in varied form, the administration of private companies, of groups of companies or of the totality of certain economic sectors previously managed by individuals, such as the land portions. nationalization is the opposite of privatization. it is also called nationalization of the means of production, although a nationalized company can be previously both national and foreign ownership. nationalization or nationalization is a very characteristic action of ideologies such as socialism and nationalism.