The answer to this question can be quite subjective. Some people will say that the telephone is the most important invention, or the automobile, or the plane, but for me personally, I'd choose antibiotics.
It is a modern-day invention (as opposed to the Middle Ages, for example) which changed our lives for the better. Before penicillin was discovered in the 1920s by Alexander Fleming, people were constantly dying because of most harmless diseases. But after antibiotics were invented, people were given a chance to recover from their illnesses much more easily.
A guiding principle of the Articles was to preserve the independence and sovereignty of the states. The weak central government established by the Articles received only those powers which the former colonies had recognized as belonging to king and parliament.
Articles of Confederation - Establishing the Government
Each state had one vote.
Each state retained all powers not
expressly delegated to Congress.
Delegates to Congress were to be appointed by state legislatures.
States would not be deprived of western lands.
His expedition lasted 2 years.
I think it’s Texas and in California in the summer the heat causes blackouts