Which civilization starts the first calender​

The United States government invested in improving the national highway system for a variety of reasons, including facilitating economic growth, enhancing national defense, and improving transportation efficiency.

How did the building of this system affect South Carolina’s economy?

The building of the national highway system had a significant impact on South Carolina's economy. The improved transportation infrastructure facilitated the movement of goods and people, making it easier for businesses to transport products to markets and for consumers to travel to tourist destinations.

This increased economic activity generated jobs and stimulated economic growth throughout the state.

In particular, the interstate highway system played a vital role in the development of South Carolina's tourism industry. The state's beaches and historic sites, such as Charleston and Myrtle Beach, became more accessible to visitors from other states, resulting in increased revenue for the state's hospitality and tourism-related businesses.

Furthermore, the construction of highways made it easier for businesses to transport goods, which helped to attract new industries to the state.

The improved infrastructure also enabled more efficient transportation of agricultural products, such as cotton and peaches, which were major contributors to the state's economy.

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1 ) because the infrastructure was crumbling and became dangerous for drivers .

2) ..................

sorry , I am not really sure about the answer for question 2 but I hope the first answer will help .

So please , if you disagree you can delete my answer .