On what date was the Declaration of Independence signed?

Which of the following inventions most directly allowed ancient farmers to produce a surplus ?

What is the significance of the battle of saratoga? a. the defeat at saratoga allowed the british to invade new england by land. b. after the defeat at saratoga france refuse to sign a treaty with the united states. c. the british won a decisive victory at saratoga. d. after the victory at saratoga france gave open support to the united states including arms money and ships.

Tim oxide reacts with the hydrogen to produce tin and water. how many moles of sno2 are needed to produce 500.0 grains of sn