Simplify the following text for a Grade 9 native English-speaking person.
Original: Following several constitutional conferences , the Constitution Act , 1867 officially proclaimed Canadian Confederation , creating `` one Dominion under the name of Canada '' on July 1 , 1867 , with four provinces : Ontario , Quebec , Nova Scotia , and New Brunswick .
Simplified: On July 1 , 1867 , Canada was united under a federal government . It included the provinces of Ontario , Quebec , New Brunswick , and Nova Scotia .