Last month, the Nepalese parliament adopted a new constitution after nearly a decade of discord that widened the political rifts that divide the country. But with the adoption of the constitution, protests have erupted among Nepal's southern Madhesi community, presenting India with an opportunity to intervene in Nepal's constitutional process. The move is the latest in a series of more assertive policy moves across South Asia and is a test of New Delhi's ability to shape events in its immediate periphery....