Alexandria Gazette, Commercial And Political

From the Boston Centinel.

From South America.--A letter has been received in town, from a gentleman in South America, of which the following are extracts;

"Buenos Ayres, July 10.--The political state of the country is such, that from the first politician to the last, an opinion cannot be given by them. Liberty and independence, unsupported by Virtue, Patriotism and Energy, are nothing; the pretensions to the former are now to the last spark extinguished, and the magistrates have ever been destitute of the latter.

At present heavy armies are rapidly approaching from the westward, which will be difficult to check, if possible.

The Portuguese are coming, to a certainty, with a very strong force by sea and land; as well as Gen. Artigas, and all the towns in this province, on the other side of the river, against this capital, which has to depend entirely upon its militia, of inferior numbers. We shall have great changes here by October--it we dont entirely fall under the old yoke. The distresses of the country will be unlimited.

Notwithstanding all this, there are desperate people here, who may be inclined still to hold out, by driving off the supplies, to annoy the enemy--in which case a century must elapse, attended with all the St. Domingo horrors, before the Country will be good to any one."

Extract of a letter from Buenos Ayres, dated July 14,

We have pretty correct information that the Portuguese expedition, of 10,000 troops has arrived in this river.