It did bring peace to countries that were trading partners.
By which you mean, peace is a precondition to being trading partners. Which means that peace is the cause, not the effect.
And socialist and "mercantilist" countries also managed to be trading partners while at peace, so that's not even a feature unique to capitalism.
For Mercantilism, trade is not a priority:
"1. Capitalism views wealth creation as the key to economic growth while mercantilism believes that economic prosperity can be achieved through the extraction of wealth.
2. A capitalist society supports a competitive business environment while mercantilism advocates monopoly.
3. Capitalism encourages consumer spending and enjoyment of life to the fullest in order to make the economy grow while mercantilism discourages extravagance of consumers to prevent outflow of money from the economy."
"Socialists believe economic inequality is bad for society, and the government is responsible for reducing it via programs that benefit the poor (e.g., free public education, free or subsidized healthcare, social security for the elderly, higher taxes on the rich). On the other hand, capitalists believe that the government does not use economic resources as efficiently as private enterprises do, and therefore society is better off with the free market determining economic winners and losers."