HELP Which inventions had the greatest impact on trade in China during the Middle Ages?

Gunpowder and paper money

Explanation:

First, powder began to be used to make firecrackers, fireworks and flares to make signals. Then they invented weapons to use in war, in rifles and rockets.

Paper money has several advantages over the currency, it is more comfortable, a bill can replace several coins, it is lighter than the metal coins, but in itself the paper currency has no value as the coins were gold and silver.

besides the fact that abraham lincoln abolished slavery, and greatly benefit black people, he had a heavy impact of the definition of what democracy was, and should be.

i do not believe this was true indefiantly the native americans would have lsot aganist america one they didndt have the resources and allies that america had and 2   indians werent as advanced at the time as they were not 3 americans had the expreince because some of the soliders from other wars fought in that war and were attecked etc