The Stilwell Road was constructed during World War II as a supply route between India and China. It was named after the allied commander, Joseph Stilwell. This road played a crucial role in providing supplies to the Chinese during the war.

Option 1: Myanmar. This is incorrect. Myanmar (formerly known as Burma) was indeed touched by the Stilwell Road. The road passed through the northern parts of Myanmar, connecting to the towns of Bhamo and Myitkyina.

Option 2: Thailand. This is the correct answer. Thailand was not touched by the Stilwell Road. The road bypassed Thailand and went directly from India through Myanmar to China.

Option 3: China. This is incorrect. The Stilwell Road constructed during World War II connected India to China. It played a vital role in supplying British forces in China and supporting Chinese efforts against the Japanese invasion.

Option 4: India. This is incorrect. The Stilwell Road started from Ledo in eastern India and ran through the mountainous terrain of present-day Myanmar, reaching China through the Burma Road.

In conclusion, the correct answer is option 2: Thailand, as it was not touched by the Stilwell Road.