Is the U. S. Constitution the Law of the Land? Unfortunately the answer to this question is no. The reason is that because your politicians have emasculated it beyond recognition. If it still were, the immigration problem would be non-existent. The Constitution gives the Congress the power to determine how a person becomes a citizen. It is the naturalization process once a person is admitted. And who can be admitted? Again the Constitution is quite specific, it is anyone the original 13 States chooses to admit. The Congress can however, prohibit all admittances.
These provisions were intended to reserve the growth of the population to the children of those already here. All immigration after that has been in violation of those provisions.
I grant that the prohibition of the importation of slaves was the reason for the last provision. But, nearly all immigration after that has been the importation of paid slaves, particularly those after the beginning of the Industrial Revolution. Why were these paid slaves needed? Because the industrialists who needed the labor were unable to attract sufficient bodies from the farm economy that was beginning to have a surplus of workers but in insufficient numbers.
Slavery is a condition where a person has insufficient skill or greater numbers of that skill than the market can support. The slaves of the old south worked for food and lodging which is in essence pay. Like the student athletes of today, their pay is free tuition and room and board but now they want wages in addition, that are all going to the pros. It is a vicious cycle created by the economic system we have adopted that, as I point out in my book The Real Economy, is doomed to ultimately fail, as it has for every society that has adopted it.