Calgary's nearby Turner Valley deposits were discovered in 1914, decades before Edmonton's Leduc #1 field in 1947.
This in part accounts for the much larger concentration of head offices of large corporations in Calgary.
Today, although the rivalry is generally shown only during sporting events there remains an 'unspoken' friendly rivalry between residents that remains on a subtle level.
Equally important, the Liberals overhauled Canada's immigration system – whereas the Conservatives had endeavoured to restrict Western settlement to British immigrants, the Liberals had encouraged immigration from other parts of Europe, such as the Austro-Hungarian Empire.
The result was that Edmonton and Northern Alberta became much more ethnically diverse than Calgary and Southern Alberta, and this at a time when prejudice against non-British ethnic groups (in particular, Slavic peoples) was commonplace among those of British extraction, adding another layer to the ill will between north and south.
Following the debate over the CPR, the next important contest between the two cities was to determine which would become Alberta's capital city when the province was created in 1905.
By this time, two new transcontinental railways had been built, both via Edmonton, under the guidance of a federal Liberal government that had replaced the Conservative government which had overseen construction of the CPR.
The Battle of Alberta is a term applied to the intense rivalry between the Canadian cities of Calgary, the province's most populous (since 1976) city, and Edmonton, the capital (since 1905) of the province of Alberta.