* Precious metals, such as gold, silver, and copper
* Minerals, such as iron ore, coal, and salt
* Oil
* Timber
* Rubber
* Cotton
* Coffee
* Tea
* Sugar
Human Resources
* Labor to work on plantations, in mines, and in factories
* Soldiers to fight in imperial wars
* Colonists to settle in new territories
Tax Revenue
* Taxes on trade, land, and other forms of wealth
Control over Trade Routes
* Control over trade routes allowed empires to monopolize trade and maximize their profits
Strategic Locations
* Strategic locations, such as ports and waterways, gave empires control over trade and military operations