[From "Liberty or Immigration"]

Machiavelli is most famous for his book The Prince[…]But his book Discourses on Livy is an incredibly insightful work[…]
Machiavelli observes in Discourses that Sparta was able to obtain and then maintain its liberty for centuries, eight centuries in fact, without any serious disturbances. This is a remarkable achievement[…]Most astute observers would note that the US Republic ended in all but name when the Northern States conquered the Confederate states in the late 1800's. And Australia reverted to a prison colony because of fears about a virus[…]
By maintaining their original population, their historical laws, and by not allowing strangers or foreigners (which includes other Greeks in this context) a foothold they were able to maintain a stable Spartan society for centuries. Spartans ruled Spartans, and because they had commonly agreed laws and customs, this rule was not resented

Indeed, Machiavelli notes the Spartan kings ensured their position, by defending their people[…]
Machiavelli notes that[…]Venice achieved the same kind of stability by granting all of its citizens who were there at its founding the right to participate in government, and by denying this right to foreigners[…]
Consistent with the biblical proscription on allowing foreigners to rule over your nation (Deut. 17:15). It is also consistent with the Biblical laws that forbid recent immigrants from having full rights of citizenship and immigrants from certain places from ever having them (Deut 23:3-8)[…]
It must be noted that in this chapter Machiavelli notes that Rome both allowed strangers to come in, and to have political power, over time, and this helped Rome burn brighter than either of these other republics. However, this also ensured that Rome would eventually be lost[…]
History and wise historians have noted that immigration is the death of both liberty and stability