Respuesta :
Because Britain was known for it's massive fleet of ships, so when rivers cut through countries they could use their ships to take that country, and create a blockade so other countries would be forced to buy from Britain.
I believe the answer is: It provided for quicker transport of manufactured goods which strengthened trade
Due to access to oceans and rivers, Great Britain have a huge opportunity to obtain cheaper materials from countries outside the european contient. It also serves as a strategic trade route for high paying buyers in Europe, Central Asia, and North America.