plantocracy

[ plan-tok-ruh-see ]
/ plænˈtɒk rə si /

noun, plural plan·toc·ra·cies.

government by plantation owners.
a ruling class of plantation owners.

British Dictionary definitions for plantocracy

plantocracy
/ (plɑːnˈtɒkrəsɪ) /

noun plural -cies

a ruling social class composed of planters