onn ell ▁interven ed , ▁march ing ▁on ▁Madrid . ▁Es par tero ▁res igned ▁power ▁in ▁O ' D onn ell ' s ▁favour ▁on ▁ 1 4 – 1 5 ▁July ▁ 1 8 5 6 , ▁and ▁Isabel la ▁II ▁asked ▁him ▁to ▁form ▁a ▁government ▁as ▁the ▁ 4 4 th ▁Prime ▁Minister ▁of ▁Spain . ▁For ▁his ▁new ▁administration , ▁O ' D onn ell ▁formed ▁the ▁Un ión ▁Liberal ▁Party , ▁which ▁was ▁designed ▁to ▁combine ▁Progress ive , ▁Mod er ate , ▁and ▁Car list ▁fa ctions . ▁O ' D onn ell ▁attempted ▁to ▁define ▁moder ate ▁policies ▁for ▁Spain ▁with ▁this ▁new ▁party , ▁advoc ating ▁la isse z - f aire ▁policies ▁and ▁conf isc ating ▁church ▁land . ▁He ▁was ▁soon ▁dismiss ed ▁after ▁only ▁a ▁few ▁months ▁in ▁power ▁on ▁ 1 2 ▁October , ▁and ▁two ▁years ▁of ▁reaction ▁followed . ▁ ▁In ▁later ▁govern ments , ▁he ▁was ▁more ▁careful . ▁O ' D onn ell ' s ▁two ▁later ▁administr ations ▁worked ▁labor iously ▁to ▁attract ▁foreign ▁invest ment ▁to ▁improve ▁Spain ' s ▁rail road ▁infrastr ucture . ▁He ▁failed ▁to ▁achieve ▁much ▁economic ▁growth , ▁however , ▁and ▁increased ▁industry ▁only ▁in ▁Bas que ▁country ▁and ▁Catal onia , ▁both ▁of ▁which ▁already ▁had ▁substantial ▁industrial ▁cent res . ▁He ▁was ▁a ▁pro ponent ▁of ▁a ▁new ▁and ▁ag gress ive ▁imperial ▁policy , ▁intended ▁princip ally ▁to ▁expand ▁Spanish ▁territory ▁in ▁Africa , ▁particularly ▁after