| Seeking 
new land for settlement, the expanding 
population of Britain’s North American 
colonies pushed over the Appalachian 
Mountains into the Ohio River valley. 
Alarmed by this intrusion, the French 
and First Peoples expelled the settlers 
in 1754 and an undeclared war broke out 
between the French and British colonies. 
Beginning in 1755, Britain and France 
sent thousands of professional soldiers 
to North America. In 1756, fighting began 
in Europe and both nations formally declared 
war. Despite 
several impressive Canadien, French, 
and First Peoples victories in the Ohio 
valley, along Lake Ontario, and near 
Lake Champlain, the tide of war gradually 
shifted in favour of Britain. British 
naval forces isolated New France while 
a British army attacked Louisbourg in 
1758. It surrendered after a seven-week 
siege, leaving Québec vulnerable. |  |