<Li> August 16, 1901: Provisions of the Provincial Government Act and its amendments extended to Ilocos Sur through Act No. 205 . </Li> <Li> August 19, 1901: Provisions of the Provincial Government Act and its amendments extended to Abra, excluding its territory east of the crest of the Cordillera Central, through Act No. 206 . </Li> <Li> August 20, 1901: Provisions of the Provincial Government Act and its amendments extended to Ilocos Norte through Act No. 207 . </Li> <Li> August 22, 1901: Provisions of the Provincial Government Act and its amendments extended to Cagayan through Act No. 209 . The Babuyan Islands and the Spanish - era province of Batanes annexed to the province . </Li>

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