Report Parameters with a space between, not working

Question

I have a problem with a report in SQL Server 2012 that uses cascading multi-valued parameters. I am using AdventureWorks2012DW as a sample, and all parameters work except for one with a space in this case its SalesTerritoryCountry and the parameter is 'North
America' which has a space. How do i get it to return data? here is my Stpre procedure for you to try.
Create Procedure dbo.uspReportParams
@Region varchar(15),
@Country varchar(60)
AS
BEGIN
SET NOCOUNT ON
Select st.SalesTerritoryGroup [Region], st.SalesTerritoryCountry [Country], r.BusinessType [Business Type], SUM(rs.SalesAmount) [Sales Amount]
from DimReseller r join FactResellerSales rs on r.ResellerKey = rs.ResellerKey
join DimDate d on rs.OrderDateKey = d.DateKey
join DimProduct p on p.ProductKey = rs.ProductKey
join DimSalesTerritory st on rs.SalesTerritoryKey = st.SalesTerritoryKey
where st.SalesTerritoryGroup IN (Select [splitdata] FROM dbo.fnSplitString (@Region,', '))
--AND st.SalesTerritoryGroup <> 'NA'
AND st.SalesTerritoryCountry IN (Select [splitdata] FROM dbo.fnSplitString (@Country,', '))
Group by st.SalesTerritoryGroup, st.SalesTerritoryCountry, r.BusinessType
END
IF i check it with other parameters it works except for North America
EXEC dbo.uspReportParams @Region = 'Europe,Pacific,North America', @Country = 'Germany,France,United Kingdom,Australia,Canada'

Answer 1

Thanxs for the reply i will explain more. The Issue is on parameter region which is 'North America', it should return data for United states and Canada.... the spaces for the SalesTerritoryCountry dont matter but for the SalesTerritoryGroup. 
I have made another discovery which has puzzled me more: If i place paramater 'North America' as the first value when executing the procedure, everything works well but if i place it elsewher ther is a problem here is a example to show what im saying
EXEC dbo.uspReportParams @Region = 'North America,Europe,Pacific', @Country = 'Germany,France,United Kingdom,Australia,Canada'
The results for Region 'North America' and Countries 'United States' + 'Canada' Show 
Its working as expected
You're using an AND condition in the filter so it will only return the countries which are included in @Country filter as it is the lower level
I guess may be what you want is this??
Create Procedure dbo.uspReportParams
@Region varchar(15),
@Country varchar(60)
AS
BEGIN
SET NOCOUNT ON
Select st.SalesTerritoryGroup [Region], st.SalesTerritoryCountry [Country], r.BusinessType [Business Type], SUM(rs.SalesAmount) [Sales Amount]
from DimReseller r join FactResellerSales rs on r.ResellerKey = rs.ResellerKey
join DimDate d on rs.OrderDateKey = d.DateKey
join DimProduct p on p.ProductKey = rs.ProductKey
join DimSalesTerritory st on rs.SalesTerritoryKey = st.SalesTerritoryKey
where (st.SalesTerritoryGroup IN (Select [splitdata] FROM dbo.fnSplitString (@Region,', '))
--AND st.SalesTerritoryGroup <> 'NA'
OR st.SalesTerritoryCountry IN (Select [splitdata] FROM dbo.fnSplitString (@Country,', ')))
Group by st.SalesTerritoryGroup, st.SalesTerritoryCountry, r.BusinessType
END
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