Explanation:

1919- Rowlatt act was passed, Jallianwala Bagh tradegy

1921- Malabar rebellion.

1922- Chauri Chaura police station took place in gorakhpur district.

1929- Lahore session

1930- Salt satyagraha by Gandhiji.

1931- New Delhi becomes the capital of India.

1947- India attained freedom from the British.

1950- Indian constitution came into force making india a republic country.

Explanation:

1851 First telegraph line in India is operational between Calcutta and Diamond Harbour.

1853 First train in India runs from Bombay to Thane.

1857 First war of Indian independence also called the Sepoy Mutiny by the British.

1881 The first complete census of population conducted on a uniform basis throughout India.

1885 Formation of Indian National Congress by A.O. Hume, Dadabhai Naoroji, Dinshaw Wacha, W.C. Bonnerjee and others.

1905 Partition of Bengal by Lord Curzon. Swadeshi Movement launched.

1909 Indian Council Act popularly known as Minto Morley reforms allowing a limited increase in the involvement of Indians in governance passed.

1911 Visit of King George V to India, Shifting of capital from Calcutta to Delhi. Jana Gana Mana first sung at Calcutta session of INC. Launch of first air mail in India & World from Bumraulli to Allahabad.

1919 Government of India Act, 1919 introducing dyarchy, Rowlatt Act, Jallianwala Bagh tragedy.

1920 Khilafat movement, Launch of Non-cooperation movement.

1922 Chauri Chaura outrage in UP, Suspension of Non-cooperation movement.

1928 Visit of Simon Commission to India, Death of Lala Lajpat Rai

1929 Resolution of complete independence at Lahore session of Indian National Congress.

1930 Dandi March, Launch of the Civil Disobedience Movement.

1931 Gandhi Irwin pact, execution of Bhagat Singh, Sukhdev and Rajguru.

1935 Government of India Act.

1942 Quit India movement, Formation of Azad Hind Fauz.

1943 Visit of Cripps Commission to India.

1946 British Cabinet mission visited India.

1947 Independence and partition of India.

1948 Assassination of Mahatma Gandhi, 1st Pak aggression

1950 India became republic