What were the main elements of the north's manufacturing system?

The correct answer is interchangeable parts or components, predominantly in the automotive industry and other machines. North created one of the world's first milling machines for metal shaping that before then, had been done by hand. This was a huge step towards  mass production of complex machines with moving parts.

it was created as a proprietorship, unlike any other colony.

explanation:

did it already

the answer is: must pay taxes on profits

since it is considered as a part of your income, profits from investments is eligible for tax payment.

the tax from your investment could be influenced by how long you decided to sell it. united states promotes keeping your investment for long term period. so, the tax rate for investments that you sell in less than one year is typically higher compared to investments that you sell in more than one year period.