How many patents were granted in the United States for new technologies during the second Industrial Revolution?Over 500,0001500100Less than 50

To analyze the question regarding the number of patents granted during the second Industrial Revolution in the United States, we should first understand the context of that period. The second Industrial Revolution spanned from approximately 1870 to 1914, a time characterized by significant technological advancements and innovations.

It is commonly known that this era witnessed a surge in patent applications due to the rapid development of technologies such as electricity, transportation, and telecommunications. By the end of the 19th century, it is estimated that:

1. Patent Quantity: More than 500,000 patents were granted in total during and immediately after this period.
2. Notable Innovations: This includes important inventions like the telephone, electric light bulb, and various machinery.

Conclusion

Given the options presented (Over 500,000, 1500, 100, Less than 50), the correct answer would be "Over 500,000" as this reflects the vast number of innovations that were patented during the second Industrial Revolution in the United States.