If I had a dollar for everytime meaning

Its actually a joke sentence.

Native speakers don't use the full sentence and it is

If I had a dollar for everytime (something) I'd be rich

something is a placeholder.

Example:
If I had a dollar for everytime I won the argument I'd  be rich.
If I had a dollar for everytime I see you giggle I'd be rich.

Historic vs Historical

Historic:
something that deserves to become history

Example:
It is historic achievement.

Historical:
It means ancient

Example:
Historical stone is found.

Abbreviation vs Acronym

Abbreviation:
It is a word which is shorter form of it.

Example:
Exam is abbreviation of Examination

Acronym:
It is a collection of letters that signifies a collection of words

Example:
WHO is Acronym of World Health Organisation 

Palestinian/Cuban cause

so what is the meaning of cause here

Here it means

A principle,aim or movement.

Dutch

Dutch adjective:
When Britain was a maritime power ...Dutch people were giving tough competition so british people started introducing the Dutch adjective for something that is of low or demeaning.
Here are some of them

Dutch courage:
one who doesn't have any courage

Dutch widow:
A prostitute

Dutch auction:
A auction in which prices are going down

Dutch concert:
A poor concert

Dutch treat:
A treat where everybody pays for themselves only

Dutch metal:
A alternative low quality metal for gold.

Assume vs Presume

Assume:
Believe something

Presume:
Believe something as there are no other options logically

Example:
1)I assume he was there
2)I presume he was there

In the former sentence there might be so many persons or nobody except him it doesn't matter but he believes he was there

In the latter sentence he believes he was there as there was nobody except him like that.

Very vs Too

Very is neutral word for something more
Too carries same meaning but it carries negative connotation.

Example:
1)He is very tall.
2)He is too tall.

The latter sentence gives a negative connotation while former doesn't