The acquisition of overseas territories affect us commercial trade by expanding the markets.
Step-by-step explanation:
Acquiring more territories by a particular country will lead to the expansion of the trade of the country which has acquired other countries because the goods manufactured by that country can be exported to the acquired territories.
Therefore expanding the markets for the home producing goods and moreover such countries also import raw material from these countries which turn out be cheap for the production of the goods. These processes turn out to be very profitable for the trade of the country acquiring other territories by reducing cost of production and profit for expanding market.