The intent was to put an end to all the quibbling about immigrants and immigration laws, as was done during the first 20 years of America's history as a country. At that point in time, the founding fathers realized that there was a country to build, and it was counter-productive to fight about who could come in. So they threw open the doors and created the "land of opportunity" that we still cherish and idealize, but which in all actuality doesn't currently exist as it originally did.

Also, in thinking about this, I realized that putting an 800-year timespan in the law, while certainly underscoring the point that we should not be spending so much time worrying about immigration, funding border patrols, the INS, and all the attendant costs associated with immigrants, contradicts the also-listed 10-year expiration rule in a different law. So, to keep in line with the "no riders" and "10-year" laws, here is my rewritten text for this proposed law:

The migration or importation of such persons as any of the states now existing shall think proper to admit, shall not be prohibited by the Congress, but a tax or duty may be imposed on such importation, not exceeding one hundred dollars for each person.

New immigrants are welcome to participate in building the country/economy, are eligible to apply for citizenship, are eligible for any jobs that they qualify for, but are not eligible for welfare-type social services for a period of 5 years after arrival in the US, or until they are naturalized as US citizens, whichever comes first.

Notes:

• The one-hundred dollar figure has been arrived at by calculating the inflated rate of the original ten-dollar amount specified in the US Constitution for roughly current rates, then rounding up a bit. I used The Inflation Calculator to calculate the value of $10.00 in the year 1800 (the first year on their calculator) in 1999 dollars (the last year on their calculator, as of this writing.) The value they gave was $95.07 in 1999 dollars.
• This law would be subject to the same 10-year expiration as other laws, allowing for periodic review, and re-enactment, if it was found to be desirable. It would also allow for recalculation of the cost due to inflation.
• Both the original clause in the US Constitution and the above proposed rewrite have a reasonable maximum cost for processing fees, but not an overly exorbitant one.
• The main complaint most Americans have about immigrants is the claim that they "steal jobs" or "go on welfare" (paid for by American tax dollars). While the concern about welfare may be valid (and is addressed in the rewritten text), it should be remembered that the "jobs" being done by immigrants are often not those which Americans like to do, and that the first time this experiment was conducted, two centuries ago, there was an explosive growth in America as these new immigrants brought culture, energy, and many new hands, backs, and minds to America, and brought them to bear upon the task of building a new country. This period saw a huge growth of new cities, towns, industry, etc. It seems to have been a successful experiment, and this proposal seeks to repeat the experiment, and quell lots of bickering and expense in trying to keep out those who most wish to help build the American Dream.