Counting all the area in the US, including mountainous areas, cities and the like, and using assumed data for population from the US Census Bureau, there is currently a little less than eight acres...
There is about 1.023 cars per person in America. (That's about 1023 cars per every thousand people in America.) In China, there is only 9 cars per 1000 people. In India, 11 cars per 1000 people.