After the initial bonhomie between US President Donald Trump and Prime Minister Narendra Modi , Trump is now speaking out against India on trade issues. Yesterday, he accused India of charging 100% tariffs on some US goods and threatened to sever trade ties with countries that he said were ‘robbing’ America. Why is Trump so angry with India? Here's a brief analysis:In financial year 2017-18, India's exports to the US were worth $47.9 billion. Imports from the US were worth $26.6 billion. This means trade balance being in India's favour by $21.3 billion. That's not the full story. Apart from the overall trade imbalance, the US is also miffed at dury-free imports from India, under Generalized System of Preferences (GSP), which it says hurt the US industry. India's imports to US under GSP were $5.6 billion, which is nearly quarter of such imports from all countries.Established in 1974, GSP is the largest and oldest US trade preference program. It is aimed at providing opportunities for many of the world’s poorest and developing countries to use trade to climb out of poverty and grow their economies. GSP provides duty-free access to about 3,500 Indian products to US markets. The Trump Administration has said it would review benefits given to Indian products under this scheme.It wants India to buy more goods from the US. A prominent example is of Harley-Davidson bikes. The US has demanded duty cuts on bikes imported to India. India reduced duty from 75% to 50% in February this year. But the US wants zero duty on these bikes. A major sticking point between the US and India is capping of prices of several expensive medical devices, such as stents and knee implants, by the Indian government. While the Indian government's decision helps patients, especially poor ones, the US says its medical device industry suffers due to price caps. It wants the price caps to go.US-origin dairy products are banned in India on religious and cultural grounds. The reason is that these dairy products are mostly derived from cows which consume feed containing internal organs, blood meal, or tissues of ruminant origin while the cow in India is considered sacred and a herbivore. The decision to prohibit US dairy products was taken in 2003 by the Vajpayee government. In 2015, after Prime Minister Narendra Modi assumed office, the US proposed to label with a ‘red dot’ to denote ‘non-vegetarian’ thedairy products derived from animal that have consumed feeds with ruminant proteins.India has so far rejected the suggestion on grounds that feeding ruminant proteins, those derived from intestinal organs of animals, to cows deeply hurts and violates Indian religious and cultural sentiments. After repeated representations from the dairy industry, Washington has conveyed to New Delhi that it has been forced to order a review of India’s GSP benefits.On the cow issue, India has told the US that it would simply have to respect Indian religious and cultural sentiments on the issue. The overall trade deficit between India and the US has reduced by about $1 billion this year while overall trade has grown by about $13 billion to a little over $125 billion for 2017-18. India has told the US that while the numbers might appear insignificant, it’s possibly the only country with a favourable trade balance with the US to show a downward trend.