Buying used from Canada

I don’t follow the political scene as I don’t like either side but there must be a reason Trump did the tariff thing. What were the trade agreements like with everyone before all this started ? Were they fair to the US? 

Headed to Bible Study, hope you all have an awesome day!

I just ordered something from Stack in England. The first time they used Royal Mail and there were no extra charges. This time they used FedEx. I will let you know if there are any additional fees when I get the shipment. The first shipment was about a month ago, if that matters. 

It's completely unpredictable. I lived in Washington State and bought a pair of ProAc speakers, made in England, from an individual in British Columbia, Canada. Drove up to fetch them and spent close to an hour at the border with a pair of confused customs agents. They finally arrived at what seemed like a completely arbitrary tariff fee of about $200 based on the fact that they were manufactured in England. I paid it and fled south.

I received a parts order several days ago from Hifi Collective in England, and there were no tariff or customs charges, just the FedEx shipping charge.  That was the third order from Hifi Collective in the last two months and there were no tariff or customs charges on any of them.  I have no idea why.