Let it be recollected that the proportion of these taxes is not to be left to the discretion of the national legislature, but is to be determined by the numbers of each State, as described in the second section of the first article. An actual census or enumeration of the people must furnish the rule, a circumstance which effectually shuts the door to partiality or oppression. The abuse of this power of taxation seems to have been provided against with guarded circumspection. In addition to the precaution just mentioned, there is a provision that "all duties, imposts, and excises shall be UNIFORM throughout the United States." It has been very properly observed by different speakers and writers on the side of the Constitution, that if the exercise of the power of internal taxation by the Union should be discovered on experiment to be really inconvenient, the federal government may then forbear the use of it, and have recourse to requisitions in its stead. By way of answer to this, it has been triumphantly asked, Why not in the first instance omit that ambiguous power, and rely upon the latter resource? Two solid answers may be given. The first is, that the exercise of that power, if convenient, will be preferable, because it will be more effectual; and it is impossible to prove in theory, or otherwise than by the experiment, that it cannot be advantageously exercised. The contrary, indeed, appears most probable. The second answer is, that the existence of such a power in the Constitution will have a strong influence in giving efficacy to requisitions. When the States know that the Union can apply itself without their agency, it will be a powerful motive for exertion on their part. As to the interference of the revenue laws of the Union, and of its members, we have already seen that there can be no clashing or repugnancy of authority. The laws cannot, therefore, in a legal sense, interfere with each other; and it is far from impossible to avoid an interference even in the policy of their different systems. An effectual expedient for this purpose will be, mutually, to abstain from those objects which either side may have first had recourse to. As neither can CONTROL the other, each will have an obvious and sensible interest in this reciprocal forbearance. And where there is an IMMEDIATE common interest, we may safely count upon its operation. When the particular debts of the States are done away, and their expenses come to be limited within their natural compass, the possibility almost of interference will vanish. A small land tax will answer the purpose of the States, and will be their most simple and most fit resource.