You are correct.
That well fed clean non- disheveled “mob” if only 1000 miles from the border trotting at 4MPH for 24 hours/day would take 10.5 days to reach the US.
7000 people using 1 gallon of water / day would use 73,500 gallons of water while crossing either a desert or jungle while moving at a brisk 4 MPH for 24 hrs/ day for 10.5 days.
Moving at these speeds will burn approximately 100 calories/ hour. meaning they will need approximately 2800 calories/ day.
1 pound of corn has a little over 1500 calories.
1 gallon of water weighs 8.3 pounds.
At two pounds of dried corn, and 1 gallon of water/ day, each person must carry 100 pounds of rations with them (50# if on a starvation march) while trotting 4 MPH for 24 hours/day for 10.5 days.
Someone is assisting this”mob”. Someone is lying to us...