Read the passage.

although the dakota territory was organized in 1861, the population was quite small, and the majority of the population were american indians. the homestead act of 1862 drew homesteaders, and soon large cattle ranches were proving to americans that farmers could be successful in the northern great plains. transportation became easier between 1871 and 1889, when more than two thousand lines of railroad track were laid across the state. the effect on the population was dramatic. in 1860 the white population of north dakota was 2,576. by 1889, that number had jumped to 191,000. both north dakota and south dakota were able to apply for statehood.

according to the passage, which factors contributed to north dakota and south dakota becoming states? check all that apply.

the establishment of a major shipping port that improved the local economy
the construction of large factories that attracted settlers looking for work
the migration of many american indians from neighboring states
the success of large cattle ranches
the expansion of railroad lines
the passing of the homestead act
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