 Thus began the effective reign of Isabella II ( 1843-1868 ), which was a complex period, not without its ups and downs, which marked the rest of the political situation of the 19th century and part of the 20th century in Spain.
<fluency>  Thus began the effective reign of Isabella II ( 1843-1868 ), which was a complex period, not without its ups and downs, which marked the rest of the political situation of the 19th century and part of the 20th century in Spain.
 Thus began the effective reign of Isabella II ( 1843–1868 ), which was a complex period, not without its ups and downs, which marked the rest of the political situation of the 19th century and part of the 20th century in Spain.