The Mexican economy is doing pretty well. Unemployment is relatively low, it's the world's 15th largest economy, has a lot of growth in areas like aerospace, automotive, energy, electronics, and has a growing private investment sector.   In fact, the economy is doing well enough that a lot of the Mexicans who have come to the US to work are going back home, because of the job growth there.

More Mexican workers leave the US each year than come here, which will result in labor shortages.

There is a lot of corruption, a ridiculous amount of violent crime, and a great gap between rich and poor, particularly in rural areas. It is worth noting that possession of arms by civilians is illegal in Mexico, and it seems to prove the much reviled aphorism that "When guns are outlawed, only outlaws will have guns."

Also worth noting, though the US has meddled excessively in Mexican affairs, the British actually have invaded and occupied Mexican territory more recently than we have.

1861, Mexican President Benito Juarez suspended Mexico's interest payments to its creditors in France, Spain and the UK. This act angered the three nations and in October 1861 the Convention of London was signed by the three nations who then sen joint navy ships to In December 1861 and took the port of Veracruz and nearby towns in a effort to force repayment.