Trudeau is trying to garner support for the North American Free Trade Agreement and promote Canada as a country that welcomes US tech companies setting up offices and hiring locals.
Later Friday, Trudeau will deliver a speech at the Ronald Reagan Presidential Library in Simi Valley, California.
But he also acknowledged that global trade is not working for everyone and said income inequality is growing worldwide.
"But, of course, the truth is President Trump and I agree that too many people have been left behind".
Another major risk is NAFTA, with Trump regularly threatening to walk away if he doesn't get a bigger deal.
Canadian Prime Minister Justin Trudeau is hanging with Salesforce CEO Marc Benioff in San Francisco on Thursday. Yesterday, during his discussion with the California governor Jerry Brown, Trudeau defended NAFTA once again.
If free trade between Canada and the US was a bad idea, "then there are no good ideas", Trudeau said during his speech to local and state legislators. The comment was an apparent reference to President Donald Trump.
Trudeau said that ending free trade between Canada and the United States would hurt the wealthy, but also harm future opportunities for the USA middle class.
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Trudeau on Wednesday said that Canada would stand strong in its negotiations with the US, saying that no deal would perhaps be better than a "bad deal".
Justin Trudeau made his prime ministerial pitch to Silicon Valley on Thursday, and had a chance to push Toronto specifically as a place for Amazon's second headquarters during a private meeting with the company's chief executive.
The next round of talks over the trade pact in Mexico later this month have loomed over the visit, which also included stops in Chicago and San Francisco.
Enterprise software startup AppDirect, which hosted Trudeau for the press event, also said that it would hire 300 Canadians and open a new Toronto office.
"We are going to expect a good deal, a fair deal", Trudeau said.
"We like to say peoplekind, not necessarily mankind", Trudeau responded. Among his desires is requiring more made-in-America auto production and shifting more government contracts to US companies.
"People forget sometimes that it's a three-way partnership, and for him to step up and be the leader, not just for Canada but for the whole pro-trade movement, is pretty symbolic of the role he's trying to play in North America".