Final answer:
The growth of the conservative movement in the 1980s was significantly influenced by the Moral Majority and the election of Ronald Reagan, who embodied and advanced the conservative agenda.
Step-by-step explanation:
The significant factors in the growth of the conservative movement during the 1980s include the influence of the Moral Majority and the election of Ronald Reagan. The Moral Majority, formed by evangelical Christians, played a crucial role in mobilizing conservative Christians to be politically active. They opposed liberal social reforms and promoted what they perceived to be traditional family values. Ronald Reagan, on the other hand, became a symbolic leader for the conservatives, particularly with his presidential victory in 1980, which was fueled by a coalition of various conservative groups and individuals dissatisfied with the preceding administrations and the cultural changes of the 1960s and 1970s.