Answer:
I think your answer is D. Accurate calendar systems.
Explanation:
there are plenty.
if you are looking for something from way back, there was the tea act and it put taxes on tea and the colonists from Boston boarded british ships and dumped the tea into the ocean, otherwise known as the Boston tea party.
<span>a result of the jay treaty was that it : makes the british agreed to remove troops from the western frontiers
The treaty was enacted in 1795 to prevent and avert war that may happened as the aftermath following some issues that arose after the treaty of paris in 1783, the treaty that ended the American revolutionary war.</span>
to provide protection from their enemies
I believe it’s A because president Lincoln was the first republican president that face the reconstruction of voting rights for blacks after the civil war
