A method of communication
Labor's work hours were limited.
The answer is Oregon. This is solidified through the treaty called the Treaty of Oregon. In this treaty, the US and the British government had created a boundary to stop states to fight over their territories. The treaty had stated that Oregon county is a joint territory between the US and the British government.
The Code of Hammurabi had its own laws on criminal and civil matters, from the 18th century.
