The official word I believe is:
Provide details of any trips Person has taken outside his/her country of origin or of residence in the last ten years (or since his/her 18th birthday if this was less than ten years ago). Include all trips: tourism, business, training, etc.
This means unless you’re traveling strictly between India and US as end points, that trip has to be included.
- If you remember your travel dates in various European countries, I would add those. They usually never ask for proof of travel history. But a lot of time, western countries (North America, EU-zone, Australia, NZ etc) exchange share a lot of information (check ‘Five Eyes’) including movement of people(passport scans), movement of money for preventing money laundering etc…
This means if you traveled to a country in EU where your information was entered into the system and if they match it with your travel history during background check, and if there’s a mismatch, you don’t want that to delay your background check.
I can imagine this being a pain if you’ve made several trips each year, but better put as much information as you can.
- When CIC says between country of residence need not be added, I think they mean current country of residence, i.e. US. I would consider UK as a third country and add travel to/from UK, just like point 1. above. You should definitely enter all trips where they have stamped your passport at entry/exit, apart from trips between country of origin and current residence.
I think CIC will know that Schengen area travelers usually don’t get stamps on passports, but unless you’re driving everywhere, you need to show passport while boarding a flight etc. (I remember I had to show my passport at all Schengen airports as US driving license was not acceptable).