What plagued Mexico's struggle for democracy?

The history of democracy in Mexico dates to the establishment of the federal republic of Mexico in 1824. After a long history under the Spanish Empire (1521-1821), Mexico gained its independence in 1821 and became the First Mexican Empire led by royalist military officer Agustín de Iturbide. Three years later, a federal republic was created under the Constitution of 1824. However, the republic was truncated by a series of military coups, most notably that of politician-general Antonio López de Santa Anna. Santa Anna held immense sway over the fledgling Mexican democracy until 1855, when he was ousted by liberal politicians.

The liberals drafted and ratified the Constitution of 1857, which enshrined rights such as universal male suffrage and eliminated Church and army privileges. The overthrowal of Santa Anna, however, led to widespread dissatisfaction among conservative Mexicans and led to a twenty-two-year conflict and two wars between conservatives and liberals. In 1862, on the invitation of Mexican conservatives, Maximilian Habsburg was crowned Emperor of Mexico after a successful French invasion of the country.

The Empire was short-lived; after its collapse in 1867, Mexican liberals regained power until 1910. Regular elections were held, but the electorate remained politically unengaged. This era was known as the Porfiriato – the presidency of Porfirio Díaz, who ascended to power a via military coup in 1876 and held power directly and indirectly until 1910. As resentment of Diaz increased, the Mexican Revolution broke out in 1910 and caused a bloody civil war, which ended with the creation of the Constitution of 1917.

Mexican politics were dominated by the secular Constitutionalists, who had won the ensuing civil war. Regular elections were held, but results were often manipulated. Though the "anti-re-electionist principle" still stood, mandating that incumbent presidents could not be re-elected, presidents often nominated their successors. The result was that the ruling Institutional Revolutionary Party (PRI) held near-complete control over the electoral mechanism, essentially turning Mexico into a one-party state until 1988, when its left-wing factions broke off. Women's suffrage was introduced in 1953.

Mexican politics saw change in 2000 when the conservative opposition National Action Party (PAN) candidate Vicente Fox won the presidential election. He was succeeded by the next candidate of PAN, Felipe Calderón, in 2006.The PRI returned to power in 2012, after Enrique Peña Nieto won presidency,[3] but were defeated by Andrés Manuel López Obrador's new National Regeneration Movement (MORENA) coalition in 2018. López Obrador was the first left-wing president in Mexico for seven decades.

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please give me brainliest mate!

the correct answer is:

b) a rich merchant.