For Mexico the years 1861 to 1867, encompassing the United States Civil War and French intervention, were violent, tumultuous years, and Mexico was already exhausted by five decades of revolution, war, civil disorder and banditry. The last years of the 1850's had witnessed the guerra de la reforma, an intense, bitter civil war. Not only was Mexico politically exhausted, she was also economically in bad need of peace to permit regeneration. The war with France, beginning in late 1861, was, however, to continue the economic as well as political strain upon Mexican society. Still, the United States Civil War, for all its tragic course north of the Rio Grande, was apparently to have a beneficial effect upon the Mexican economy in several aspects.