The Rhode Islander

Important News from Mexico.
Despatches to the American Government.

We learn from the Savannah papers of the 24th inst., of the arrival there of John L. Dorsey, Esq., from the city of Mexico, with despatches to the U. S. Government from Gen. Waddy Thompson, our Minister at Mexico. They are said to be of a very important character, and relate to our difficulties with that country. A great excitement existed, and a spirit of hostility was displayed against citizens of the United States in Mexico. The government of Mexico has issued a proclamation in which the most abusive and degrading terms were applied to our government, denouncing our citizens as "robbers, thieves, and scoundrels," and holding out the idea that the citizens of the United States were coming there to plunder their churches of their gold and silver, insult their females, and abuse their religion. This contains a solemn appeal to the people of Mexico to assemble, and unite together for the purpose of resisting the aggression of the U. States. Already their army amounts to 50,000 men, and it is daily augmenting. Upwards of 20,000 of them have been ordered to the frontier of Texas, with the avowed purpose of reconquering that country.

M. de Bocanegra has resigned his station as Minister of Exterior Relations. He has been succeeded by Mr. Alaman who was Minister of the same department under Iturbide.

The reply of Mr. Webster had not reached the city of Mexico when Mr. Dorsey left there.

From the excitement which was manifested when M. de Bocanegra's circulars appeared in the Government paper Diario, Mr. Dorsey feels confident that Mr. Webster's reply will induce Gen. Santa Anna to expel the Americans from the Mexican territory.

As soon as the difficulties thickened in the country in relation to the United States, ministers were despatched by Mexico to all the South American Republics soliciting succor. They held the following language:—That the United States would conquer this country, and unless you enable us to resist such aggressions as may be perpetrated by the United States—she will proceed to embrace in her mighty grasp the whole of the Southern continent.

Accordingly, Columbia has agreed to furnish 2,000 men, and more pecuniary aid. No answers to these propositions had been received from the other Republics.

Mr. Dorsey supposes that the two steamers recently purchased by Mexico, in England, will bring out to Mexico 2,000 men, all prepared for war-like purposes.

In conclusion the Republic remarks, that Santa Anna, is desirous of concentrating public opinion, of subduing prejudices and aspirations, and bringing the warfare of the nation to bear upon one single object—under that impression a war with any foreign power may be desirable. Such a state of things would tend to the perpetuation of his dictatorial power—and hence it is, that we infer, that a war with Mexico is not very improbable.

The fort at Vera Cruz has been put in complete order.