What?

Are you telling me that the people who, in the 18th century, broke away from the most powerful empire on earth at the time, and the people who moved a country from the Atlantic Ocean to the Pacific Ocean in the 19th century, and the country that built the Panama Canal in the early days of the 20th century,and repeatedly flew to the moon in the latter days 20th century is incapable of building a wall to protect its border in the 21st century?