盐业引岸专商制度与自由贸易制度之争由来已久。
There was a longstanding controversy between the salt dealer monopoly system and free trade system.
保持稳定的经济环境，以确保自由贸易制度的顺利执行。
The prevailing economic setting must be kept stable in order to ensure the smooth operation of the free trade system.
直到今天两个地区间仍会就南部脱离奴隶制度保护州的权利以及自由贸易权利产生争执不下。
To this day there is an argument raging between the two areas over whether the south seceded to maintain slavery or to protect states' rights, and the idea of free trade.
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