Refused Canada Business visa with 21 visas in my passports [closed]

I was refused a Canada Business visa. They said the reasons were: travel history, purpose of travel, and funds. I was shocked because I have 21 visas in the last eight years in three passports:

3off 2-years USA (one still valid),
2off UK (one still valid 10-years),
10off Schenghen (all Germany),
South Africa, Dubai, Brazil, 2off China, and Qatar.

All visas were used. I have travelled out of my country, Nigeria, more than 35 times. In my introduction letter I stated my travel plan. I want to visit the USA then a conference in Canada for four days. I also had my invitation letter and bank statements with at least $4,000.

Why was I refused?

What can I do now?

I provided all the check list required, would add refusal page now

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How can I get Canada visa after refusal?

If my immigration application is refused, do I have to wait before I apply again? If we refuse your application to come to Canada, you can apply again at any time, unless your decision letter says you can't. You should only apply again if you can include information that you didn't include before.

Does previous visa rejection affect Canada PR?

No. If your application was refused, applying again with the same information, even with an immigration or travel agent, will not change this decision. Your application may be refused because: the official deciding your case has reason to believe you'll stay in Canada beyond your authorized stay.

Does visa rejection appear on passport?

When this happens, you will receive a letter stating the outcome, and depending on the country, and the reason for the visa rejection, there may be a visa refusal stamp on the passport.

Is it possible to get visa after rejection?

As per some immigrant department of certain countries, you cannot reapply immediately after your visa application was rejected was because the conditions due to which it was refused will not change overnight. Hence, you can only reapply in most cases six months after the refusal of your visa application.

Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.

Images: Markus Winkler, Mr Borys, Tima Miroshnichenko, Trang Doan