The next time you get wacko liberals screaming about over population (ok, they've mostly quieted down but you still see it sometimes), give them a dose of reality.
Population of Earth
260,000 square miles of Texas land. Let's say 3/4 of that can be used. 195,000 square miles.
= 7,248,384,000,000 square feet.
So, yes, technically every single person on the Earth can fit in Texas. But it's not really livable unless you consolidate.
What if we use half of the US? From North Dakota down to Texas and all states East of that? Taking just the land space (no water) and then only using 3/4 of that gives us:
37,274,117,760,000 square feet of total space.
That's 69x69 square feet per person.
A 2 story with finished basement house that's 30x40 gives 3600 square feet living space.
With an attached 2 car garage would be an extra 24x24. Dimensions then become 54x40-ish.
Now, on to roads. Let's say 2 lane road is 30 feet wide.
If each house width takes up 56 feet (54 with 2 feet to spare) but the length is only 40, we can extend the length to 50 to give each house 10 feet of yard space. That leaves each row with 15 feet extra space. We can fit a 30 foot road between each row of houses.
We have to find room for crossroads now for each block. Rows of roads are set. No problem on spacing. Each house takes up 56 feet, leaving only 13 feet free space. 2 lane roads can be as small as 22 feet wide, so having cross roads is definitely possible.
There you have it, all of the worlds population fitting into half of the United States and every single person (man, woman, child, babies, etc) has enough space for a 3600 square foot house with a 2 car garage.
Remember, that gives each person that much space. Factor in families as one unit, using high rise towers, apartment complexes, condos, etc will majorly cut down on how much space is needed. Basically, it would be no problem at all to fit the entire world's population into the United States comfortably with all major necessities (water, electric, gas, stores, etc). The Earth is not overpopulated. Not by a long shot. In fact, we could double the population and it still wouldn't be over populated.