Southern "dixiecrats" left the democratic party because:

They did not support Truman's civil right policies.

The States' Rights Democratic Party, customarily called the Dixiecrats, was a segregationist political party in the United States. It was founded in 1948 as a breakaway wing of the Democratic Party resolved to protect states' rights to enact racial segregation against what they considered to be an oppressive federal government.

The Dixiecrats resisted racial integration and aspired to retain Jim Crow laws and white supremacy against federal intervention.

hernan cortes;

explanation:

martin luther king (1929-1968) was an activist for the african american rights, mr. king has a profile of a kind leader that built a tenacity, respect and full of hope future. he was an activist through civil disobedience and no violence pressure mechanisms. he tried to build a more egalitarian and fair society. his efforts carried a reivindication message of the civilian rights to every west corners. for that reason, he won the nobel prize in 1964.