contestada

HELP I'M BEING TIMED!!! The federal government expanded the national parks system due to
1.the financial benefit of setting aside land assets to borrow against.
2.the need to use federal land for the expansion of the transcontinental rail system.
3.the activism of environmental groups like the Sierra Club and the National Audubon Society.
4.the lobbying of urban progressive groups to preserve endangered wildlife on protected land.