Your tax rate is based on your income. 15% tax rate is relatively low for any country. I bet your Hu*****and has a lower salary in Canada than in US. I would also bet you that for the same amount of salary, you will pay more tax in Canada than in US. Besides, you were paying 15% sale tax already before any income/property taxes.
You got a highly capable hu*****and and I am glad you are in US now.