In the American Old West , overland trails were built by pioneers and immigrants throughout the 19th century and especially between 1829 and 1870 as an alternative to sea and railroad transport .
ADP DET PROPN PROPN PROPN , ADJ NOUN AUX VERB ADP NOUN CCONJ NOUN ADP DET ADJ NOUN CCONJ ADV ADP NUM CCONJ NUM ADP DET NOUN ADP NOUN CCONJ NOUN NOUN .