With limited land and a burgeoning population to support, they had to either do it by conquest or trade. They elected trade.
The Navigation Acts forced the colonists to trade with England and limited trade with other countries.
Trade - 1997 was released on: USA: 4 August 2005 (limited)
Allied Manufacturing and Trade Industries Limited
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That international business is not limited by tariffs or quotas
The sizes of the mountains make trade difficult.
They do, but bear in mind that these countries also have various free trade agreements, so that a lot of trade is not limited by tariffs. Only some trade is limited.
The general idea that international business should not be limited by tariffs or quotas is known as "free trade."
The Navigation Acts forced the colonists to trade with England and limited trade with other countries.
Embargo act of 1807
Trade Your Wings - 2011 was released on: USA: 17 November 2011 (limited)